Comparison EMOS P2311 vs Wuben F5

General type of flashlight.

Hand lamps for general use are divided into full-size and compact. However, in addition to this, on the market you can find many models with a narrower specialization and/or specific design and mounting features: headlamps ; touring devices, including self-contained dynamo lights, L-shaped lights, and diving models; powerful hand lamps and ultra-compact key chains ; auxiliary lighting systems ; as well as underbarrel models and baton flashlights widely used in law enforcement agencies. It should be noted that one model can belong to several types at once. For example, most underbarrel flashlights are equipped with a removable mount for mounting on a weapon, and without such a mount they turn into hand-held or hand-held compact ones; and L-shaped models, in principle, are not an independent type of flashlights — most often this is a design feature of hand-held compact or head-mounted devices (or even models that combine both of these applications).

— Manual. Full-size hand-held flashlights over 20 cm long and weighing over 200 g represent a kin...d of "middle class". They are designed for those for whom compactness does not play a decisive role and functionality is important first of all. Such lights can carry on board more than 1 LED and powerful power supplies, providing a good luminous flux; they are often supplied with various additional functions.

— Manual compact. This type of flashlight is somewhat larger than key fobs, but can still be classified as compact devices: hand-held compacts look like a tube up to 20 cm long and weighing up to 200 g. They rarely install more than one LED, but their dimensions and weight already allow the use of fairly powerful sources supply, which has a positive effect on the characteristics of the luminous flux (see "Maximum luminous flux"). In addition, a number of additional functions can be used in this type of flashlight, such as focus and brightness adjustment (see below).

— Lantern on the forehead. Flashlights designed to be mounted on the head — usually with special elastic straps that can be adjusted to fit. Mounting features impose restrictions on the weight and dimensions of the lantern, which affects the functionality. When purchasing such a flashlight, it is worth considering that high brightness in this case may be a disadvantage — if you need light to work with objects in close proximity, excessive brightness quickly tyres your eyes. In this case, it may make sense to pay attention to models with brightness control (see below for more details). Typically, such models have the ability to adjust the angle of the beam, but the possibility (and features) of such adjustment needs to be specified separately.

— L-shaped. Lanterns in which the beam of light is directed perpendicular to the body; the body itself, usually, has a cylindrical or close to it shape. Most of these models, according to the main format, belong to hand-held compact ones, and many also allow use in the headlamp format (see above for both). Anyway, L-shaped lanterns with the possibility of manual use have a characteristic clip on the body — on the opposite side of the lamp. Such a clip allows you to hang the device on a belt, the edge of a pocket, an element of an unloading vest or other overalls, etc.; in this case, the light beam will be directed forward, the vertical position of the case will ensure the stability of the device, and the user's hands will be free. (Note that the first L-shaped lanterns designed for such wearing appeared as an element of army equipment — back in World War II, the US military fully appreciated the merits of such a design).
As for the forehead installation, in such cases the body is placed horizontally, and its mount is made movable. Turning the lantern in such a mount, you can set almost any angle of the beam; at the same time, regardless of this angle, the position of the lantern remains equally stable (whereas in some headrests with “heads” of an inclined design, such a “head” may tend to roll forward as the mount wears out).

— Manual lamp. The most powerful type of hand lamps, which can even be called "hand spotlights". Most of these devices are designed to give out a long-range and at the same time sufficiently thick beam of light — much wider than in many other types of lanterns. Actually, the illumination range of hand-held lamps often exceeds 100 or even 200 m, while the large beam width makes it possible to very effectively detect individual objects even at such large distances. Another, less common type of such devices are models that have a short range, but are capable of illuminating a vast area.
Anyway, flashlights of this type turn out to be quite large and heavy, so initially they are not designed to be constantly carried with you (although even one and a half to two hours with such a device in your hands usually do not cause much discomfort). It is worth paying attention to hand lamps in cases where the effective detection range (or bright illumination of a vast area) is of the most fundamental importance to you. In particular, such devices are very popular in rescue services: a powerful beam of a "portable searchlight" is indispensable for search operations at night. Also among the lamps of this type there are so-called "inspection" models, well suited for inspecting machines, industrial equipment, communications (cables, pipelines), etc.

— Tourist. Tourist lamps are mainly lanterns that were originally intended for organizing lighting in a camp, at a halt, etc. Such devices provide diffused light with a coverage of 360 ° horizontally and most often allow installation directly on the ground. In addition, most of them have a hook for hanging, sometimes supplemented with a built-in magnet (see below for both). Thus, such a lantern can be mounted on a tree branch, under the ceiling of a tent / awning, etc., significantly expanding the area of illumination — or hung on a backpack or other equipment, illuminating the path for several people at once.
Most tourist lanterns have only this specialization; however, there are also models that allow other applications. Usually these are hand-held compact devices of a special design — with a retractable diffuser made of white matte material. Such a device allows you to turn the directional beam into diffused light with full horizontal coverage; and when such a beam is not needed, the diffuser can be hidden in the housing. However, some of the more traditional travel models also have a folding design — it makes it easier to carry after hours, especially if the device needs to be hidden in a backpack or bag with other things.

— Dynamo flashlight. Lanterns equipped with a built-in generator (dynamo) that generates energy due to the user's muscular strength — usually for this you have to swing or twist a special lever. Thus, it is possible to recharge the built-in battery even in the absence of power sources (and such lights most often work from batteries). Such features are especially relevant for those who often have to be "far from civilization": tourists, military, researchers, etc. At the same time, dynamo lights can have different specializations — compact, tourist, etc.

— For diving. Lanterns originally designed for diving and long stays at great depths — usually from 50 m or more. Such models, by definition, have a sealed waterproof housing (see "Dust and water protection"). In addition, diving lights are often designed with specific features designed to provide additional convenience and safety. For example, the body can have bright colours or additional inserts that increase visibility under water, as well as be made of lightweight material so that the flashlight released from the hand floats to the surface and does not sink. Often, the device is supplemented with a carabiner for attaching to equipment or a hand strap (see "Complete set"). It is because of these additional features that not every flashlight with a high level of water protection is considered diving. Therefore, it is worth looking for a lamp specifically for diving among the models of this category.

— Auxiliary lighting. Lanterns designed to organize additional stationary lighting where there is no light or it is not enough. In a sense, such models are similar to tourist camping ones (see above), they can also be used in a parking lot or in a tent. However, the matter is not limited to this: many auxiliary lamps are originally designed for use in workshops, garages, etc. Some of them can also be hung on the open hood of a car, which can be very important for field repairs. But such models are not designed for carrying in hands: it is technically possible, but not very convenient.

— Trinket. This category includes the most compact models: their weight, usually, does not exceed 50 g, and the length is 10 cm. Hence the name — most of these lanterns can be worn instead of a keychain on a keychain. Actually, the convenience of wearing is the main advantage of key rings: you can always have such a flashlight at hand. The main disadvantage is low power: key fobs are usually equipped with one LED (see "Number of diodes"), and any "solid" power source in a compact case will not fit. At the same time, such lamps are quite enough for simple everyday tasks — for example, to illuminate the road on an unlit section of the street or find a keyhole if a light bulb has burned out in the entrance.

— Underbarrel. Flashlights designed to be mounted on a weapon are most often under the barrel, but installation on the side is also technically acceptable. Many of these models are essentially hand-held compact flashlights (see above), supplemented by a removable weapon mount (or the ability to install on such a mount — see "Packaging"), as well as, in most cases, a remote button (see below) ; however, there are also purely underbarrel models in which the mount is not removed. In both cases, the mount is usually designed for a standard Weaver / Picatinny rail, but this point needs to be specified separately. This also applies to the possibility of full-fledged use with firearms: the fact is that some underbarrel lights are intended for airsoft drives and are simply not designed for powerful recoil.

— Lantern-baton. Lanterns with a baton or baseball bat body and are strong enough to strike. Such a flashlight can be a very useful addition to the equipment of a watchman or law enforcement officer. Note that some so-called patrol lights, hand-held lights in a large and durable body of traditional design, also allow the use as a “percussion tool”. However, for them, such an application is an extreme case, while baton lamps are initially created as reliable and impact resistant as possible. Therefore, patrol models in our catalog are still not assigned to this category, but to ordinary hand lamps.

The type of lamp installed in the flashlight.

Nowadays, the most widespread models on LEDs(with or without a reflector). Halogen lamps are used much less frequently (alone or in combination with LEDs), xenon lamps, krypton lamps, fluorescent lamps, and in some models you can even find classic incandescent lamps. A separate type of light source is a laser. Here is a more detailed description of the most relevant options for today:

— LEDs. They can also be referred to as LED — an abbreviation of the English name. The most advanced type of lamps today, used in the vast majority of modern flashlights. One of the key advantages of LEDs is extremely high efficiency — as a result, they provide excellent brightness with low power consumption and small size, and they practically do not heat up during operation. LEDs can be made both in the form of separate point light sources and in the form of COB panels of a fairly large area; see Diode Model for details. Also, such light sources are resistant to shock, shock and low temperatures; with all this, they are generally inexpensive and have practically no noticeable shortcomings.

— LED with reflector. In lanterns with this type of lamp, LEDs (see above about them) are installed in special-shaped recesses covered with reflective material. Thank...s to this design, the light emitted by the LED to the sides is reflected and directed forward, in the same direction as the main stream. This significantly increases the overall brightness of the flashlight, which is especially important for compact models with a single LED of relatively low brightness. Actually, most compact types (see "Type") have just such a lamp design.

— Halogen lamp. One of the most popular modifications of a classic incandescent lamp: the light source is a hot metal spiral in a sealed glass flask filled with gas with the addition of bromine or iodine vapor (these substances are so-called halogens — hence the name of the lamps themselves). This has a positive effect on efficiency and allows you to achieve a fairly high brightness; so that modern lanterns with such lamps are usually referred to as hand-held lamps. At the same time, even in such devices, such lamps are becoming less and less common, being replaced by the LEDs described above.

— LEDs / halogen lamp. The combination in the design of the two light sources described above at once; usually the "halogen" is installed in the centre, and the LEDs are around it. At one time, this combination appeared as an attempt to create sufficiently powerful lighting devices that would consume less energy than analogues with halogen lamps, while costing less than pure LED ones. In addition, such a design provided additional features for adjusting the operating mode: it could be changed simply by turning on the existing light sources together or separately. However, with the development and cheapening of LED technologies, this option has practically lost its relevance; today it is extremely rare.

— Xenon lamp. This term can mean two types of light sources: one of the modifications of an incandescent lamp, where the bulb with a spiral is filled with an inert xenon gas, or a gas discharge lamp, in which the light source is an electric arc in the same xenon medium. The first variety was used mainly in small pocket flashlights, the second — in hand lamps. At one time, xenon lamps (both varieties) had very decent indicators of efficiency and brightness, although they were not cheap. However, again, the development of LEDs made the production of flashlights with such lamps impractical.

— Incandescent lamp. In this case, we mean classic incandescent lamps that do not belong to more advanced varieties — halogen, xenon, krypton, etc. Recall that the light source in such a lamp is a hot metal spiral in a glass bulb, which is filled either with vacuum (in miniature light bulbs), or a mixture of argon and nitrogen (in larger ones). Anyway, such lamps nowadays are considered completely obsolete — primarily due to low efficiency, which results in low brightness with significant power consumption, as well as strong heating during operation. However, nowadays this option can still be found in individual lamps — mainly hand-held lamps for the construction industry, powered by standard replaceable batteries for power tools. "Gluttony" in terms of energy consumption for such lamps is not critical, and the bulbs themselves are extremely cheap.

— Laser. The laser beam itself has a high effective range, but a small thickness. Therefore, flashlights with such light sources are usually equipped with adjustable optics, with which you can scatter the beam and turn its “imprint” from a point into a fairly large spot. Typically, laser flashlights have a specific purpose: illumination and target designation when hunting at night (for this, a mount on an optical sight is often provided), giving light signals, etc. Note that when using such devices, care must be taken: if it gets into the eyes, the laser beam can not only blind, but also cause irreversible damage, even at a fairly large distance.

The remaining types of lamps nowadays are practically ousted from the market by LEDs and are found mainly in frankly outdated models. It makes no sense to describe them in detail, we note only the key features:

• Fluorescent lamp. One of the names for fluorescent lamps, known colloquially as "fluorescent lamps". The luminous flux itself turns out to be scattered, so such light sources were used mainly in tourist lanterns and individual models of hand-held lamps.
• krypton lamp. An incandescent lamp with a bulb filled with krypton to increase brightness and reduce heat. Due to the high cost of the filler, such lamps were mostly made miniature and used in lanterns of the appropriate size.

The number of LEDs (see "Lamp type") provided in the design of the lantern.

At first glance, the more LEDs, the more powerful this model. However, in fact, things are not so clear cut. Firstly, one high-end LED may well provide more light output than several inexpensive diodes. Secondly, modern luminaires can use both traditional LEDs and arrays of numerous miniature diodes on a common basis. Such arrays can be implemented using SMD technology or more advanced COB; the differences between these options are described in more detail in the Diode Model section, here we note that a solid SMD or COB plate is also considered to be 1 LED — despite the fact that in terms of luminosity it can exceed conventional LEDs by several times, or even orders of magnitude.

Thus, it is hardly worth directly evaluating the brightness and efficiency of the flashlight by this parameter. But what the number of diodes often directly affects is reliability: most “repeatedly charged” lamps are able to continue working even if some of the diodes fail. In addition, in some types of flashlights — in particular, tourist models and hand-held diffused lamps (see "Type") — each LED illuminates a separate sector, and together they cover a full 360 ° horizontally.

The maximum luminous flux provided by the lantern.

Luminous flux (denoted in lumens) can be described as the total amount of light produced by an LED or other light source and distributed in all directions where this source shines by itself (without lenses, reflectors, etc.). In fact, this means that the capabilities of the flashlight depend not only on the luminous flux, but also on the angle of illumination (see "Angle of illumination (light)"). For example, a relatively weak stream can be concentrated into a narrow beam, providing good range; and a large number of lumens will inevitably be needed to effectively cover a wide area.

Note that the coverage angle is not always specified in the characteristics, and even with such data it is difficult to immediately assess the real capabilities of the flashlight. Therefore, for such an assessment, it is best to use information about the actual illumination range (see below), and also take into account the general type of device (see above). For example, for the same number of lumens, a handheld flashlight with a reflector to form a directional beam will give a noticeably greater range than a tourist lamp with 360 ° coverage.

It should also be borne in mind that the high brightness of the flashlight is far from always justified, and it is worth choosing according to this parameter, taking into account the actual conditions of use. S...o, when working at short ranges, bright light can become a hindrance: it tyres the eyes and can blind others. In addition, an increase in brightness usually requires more powerful sources of both light and power, and the weight and dimensions of the lantern increase accordingly.

The maximum range at which the flashlight provides any effective illumination of objects. Different manufacturers have different criteria for this efficiency when measuring ranges, and therefore it is only possible to unequivocally compare among themselves in range only models of one manufacturer. At the same time, this parameter allows us to compare models from different manufacturers with some certainty: for example, flashlights with a lighting range of 15 m and 100 m will clearly belong to different range classes, regardless of manufacturers.

Note that the range of illumination depends not only on the maximum luminous flux provided by the lantern (see above), but also on the features of its design: the narrower the beam is provided by the reflector of the lantern, the greater the range will be, and vice versa — scattered light does not spread far. Some models allow you to adjust the beam width depending on the requirements of the situation (for more details, see "Adjusting the focus").

It is also worth bearing in mind that models with the same claimed lighting range can cover different spaces. For example, a hand lamp (see Type) with a reflector diameter of 20 cm will be able to provide a wider beam than a conventional hand lamp with a 5 cm reflector. And although in both cases the objects that fall into the light spot will be illuminated in the same way, however, in the first case, the size of the spot itself will be larger, and the actual efficien...cy of the flashlight will be correspondingly higher (in light of the fact that it is easier to "feel" individual objects with a wide beam, especially at a considerable distance).

Maximum runtime of the flashlight without changing batteries or recharging the battery.

Note that in models with brightness control, this time is indicated for the most modest and, accordingly, economical mode. For example, in a flashlight with a maximum luminous flux of 1000 lm, the claimed operating time of 20 hours can be achieved at a brightness of only 30 lm, and at maximum battery life may not exceed half an hour. These nuances should be clarified according to the detailed characteristics. However, also note that additional modes of operation (see below) are not taken into account in this case: for example, if the flashlight from our example in SOS mode can operate for 30 hours, the characteristics will still state 20 hours.

It is also worth bearing in mind that for models with replaceable batteries, the actual operating time will also depend on the quality of such batteries. For example, for flashlights for AA and AAA elements, battery life is most often given when using high-quality alkaline batteries; if instead of them inexpensive saline ones are used, the operating time may be several times shorter.

In general, when choosing a flashlight according to the maximum operating time, it does not always make sense to focus on “long-playing” models: they often have either low power or impressive weight / dimensions, and the price can significantly “bite”. Flashlights with a long battery life will be useful first of all to those who have to s...tay “away from civilization” for a long time: extreme tourists, rescuers, military, etc. And for most everyday tasks in a modern city, and even for trips to nature for several days, up to 10 hours is enough.

The number of brightness levels provided in the flashlight design. Most modern models have one level of brightness, but there are models with the ability to adjust. Several levels of brightness allow you to choose the best option for a particular case: for example, to view a small room, you can reduce the brightness and save battery power, while in a large warehouse you may need full power of the flashlight. Accordingly, the more brightness levels are provided in the design of the flashlight, the wider your options for choosing the best option will be.

Also note that in addition to step-by-step brightness adjustment, with fixed levels, modern flashlights can also be used with smooth adjustment. It is detailed below; here we note that the stepped format is technically simpler, cheaper, and therefore is used much more often. And in individual lamps, these options are combined — for them, the characteristics indicate both the number of individual brightness levels and the presence of smooth adjustment. The specific way to implement such a combination may be different. For example, a brightness control ring can have several fixed levels with clear values, and the ability to set any intermediate position between these values; the main mode of operation with smooth adjustment can be supplemented with a fixed level of reduced or increased brightness; etc.

The type of batteries used in the flashlight.

The most popular nowadays are replaceable cells in sizes AA, AAA, C, D and CR123, replaceable lithium-ion 18650 batteries, as well as branded batteries. At the same time, some models from the latter category are designed for standard batteries for power tools and are supplied without their own power sources at all; such devices are commonly referred to as the so-called building lights. And here is a more detailed description of the different types of food:

— AA. Batteries, colloquially known as "finger-type" batteries. One of the most common sizes nowadays; such cells are available both as disposable batteries and as rechargeable batteries, and they are sold almost everywhere. On the other hand, in modern flashlights this option is less common than the more miniature AAA — the development and reduction in the cost of LEDs has made it possible to effectively use more compact power supplies.
Note that "finger" batteries can vary markedly in capacity; accordingly, the battery life of a flashlight with such a power supply will be different — depending on the brand of batteries (accumulators) used. Also note that the use of such cells (like most replacement batteries) is inevitably associate...d with additional expenses: you will either have to regularly buy fresh disposable cells, or spend money on a set of batteries with a charger.

— AAA. They are also "little finger" batteries — by analogy with the "finger" ones described above. They are also available in different formats — both batteries and accumulators — and in different capacities and prices. They are smaller than AA, which is why they are generally inferior to them in terms of capacity. On the other hand, modern LEDs often have enough of such power; and compactness is often more important than high capacity. Therefore, AAA elements in modern flashlights are much more common than AA.

— C. 1.5-volt cylindrical batteries with dimensions of 50x26.2 mm; approximately equal in length to AA, but much thicker, due to which they have a much higher capacity. Some time ago they were quite popular, but now they are used extremely rarely — mainly in devices where the dimensions of the case initially allow the installation of such power sources (a typical example is batons, see "Type").

— D. Cylindrical batteries, the largest (61.5x34.2 mm), capacious and powerful among the currently used 1.5-volt power supplies. Similar to the elements of type C described above, they are rarely used, mainly in lanterns that initially assume large sizes.

— CR123. Cylindrical batteries. They have a length of 34.5 mm and a diameter of 17 mm, due to which they resemble a smaller variation of type C, but differ in operating voltage — 3 V. In the battery version, they are marked as CR123A. In general, they are quite rare, mainly in hand-held compact models and key chains, as well as underbarrel flashlights for pistols (see "Type"); however, specifically among these categories, such batteries are quite popular.

— 18650. In general, nowadays, a whole family of batteries is produced that use a 5-digit marking — for example, 14500 and 17650. All of them are made using lithium-ion technology, and have a cylindrical shape and a voltage of 3.7 V; the marking indicates the dimensions of such batteries in diameter and length (see below for more details). Specifically, 18650 (diameter 18 mm, length 65 mm) is the most popular type of such elements — both in general and specifically among flashlights. This is primarily due to the combination of compact dimensions and fairly solid performance. At the same time, thanks to cheaper technologies, 18650 batteries can now be used even in low-cost models — including those initially supplied in the kit. However, anyway, it would not hurt to clarify the complete set of a flashlight with such a power supply separately — and this applies to both the battery and the options for charging it available “out of the box” (for more details, see “Packaging”).
In general, such elements combine the advantages of replaceable batteries and branded batteries. On the one hand, the power source is reusable; when the charge is exhausted, you do not need to spend money on fresh batteries every time; on the other hand, if desired, you can purchase several batteries and quickly change them as needed. And with a separate charger, you can completely reduce work interruptions to zero: while one set of batteries is in use, the rest can be charged.

— Accumulator. This option means that the flashlight uses a branded battery that does not belong to standard sizes (and in many models it is also non-removable). One of the advantages of such a power supply is that the user does not need to spend additional time and money on buying batteries: the power supply is initially supplied in the kit, and when the energy is depleted, it is enough to charge it. At the same time, the delivery set may include both an adapter for an outlet and a car charger (for more details, see "Packaging"). The second advantage is that branded batteries are often more compact and at the same time more capacious than replacement batteries; and in general, such a battery is easier to fit into the design of a flashlight (especially non-standard). Among the key disadvantages of this option, first of all, the impossibility of a quick replacement can be noted — usually, a dead battery needs to be charged, which takes time and a power source. In addition, having your own battery inevitably affects the cost; this is especially noticeable when comparing low-cost models of rechargeable flashlights with battery-powered counterparts. However, the difference in price can quickly pay off with intensive use.
A special case is the so-called "construction" rechargeable lights. They are produced mainly by large manufacturers of power tools (Bosch, DeWalt, Makita, etc.) and use replaceable batteries for tools of the “native” brand as power sources. At the same time, such a battery is usually not included in the kit — it is assumed that it is more convenient for the user to buy a battery on their own, at their discretion (or that the household already has a branded tool and, accordingly, a power source).

In addition, more rare and specific food options can be found in flashlights:

— AAAA. Batteries are even smaller than the "little finger" AAA — 43 mm in length and 8.3 mm in diameter. They are used in some thin compact format lanterns, many of these models resemble fountain pens in shape and size.

— Replaceable Li-Ion batteries with a 5-digit digital marking — similar to the 18650 described above, but differing in size. Specifically, among the flashlights you can find the following form factors of similar power supplies: 10180, 10440, 14430, 14500, 16340, 17650, 21700, 26650, 32650. All of them have a standard voltage of 3.7 V, and the size of the element can be determined by marking: the first two digits correspond to its diameter, the second two to its length (both in millimetres). The larger the battery, the higher its capacity and, accordingly, the power supply.
Separately, it is worth noting that the 14500 cells are identical in size to conventional AAA finger batteries, but differ from them in operating voltage. In some flashlights this difference is taken into account, and they can use both types of power sources (with less battery life and/or brightness when running on batteries). However, in general, the possibility of such a replacement needs to be clarified in each case.

— Series CR****. Batteries — "coins" of a characteristic disk-shaped form based on lithium technology (not to be confused with lithium-ion batteries — in this case we are talking about disposable power supplies). The numbers in the marking indicate a specific size — for example, the CR2032 marking corresponds to 20 mm in diameter and 3.2 mm in thickness. Actually, CR2032 is one of the most popular sizes of such batteries; besides him, you can find CR1220, CR1616, CR2016 and CR2032 in flashlights. All such power sources are mainly used in compact low-power flashlights, in particular, key fobs (see "Type").

— Series AG**. The "AG" suffix with a number (one or two) is used to refer to miniature alkaline manganese type disposable batteries manufactured by Seiko and some other brands. The larger the number in the designation, the larger the size of the battery: the smallest of these elements, AG0, have a diameter of 5.8 mm and a thickness of just over 2 mm, and the largest (of those used in flashlights), AG13, are 11.6 mm in diameter and 5.4 mm thick. The main scope of such elements is miniature flashlights, including key chains.

— Series LR**. In fact, it is a complete analogue of the AG series described above **; the only difference is that AG is a brand name, while LR is used as a common international designation. In addition, there is no clear relationship in this standard between the number in the designation and the actual dimensions of the battery: for example, LR41 is larger than LR58, and LR44 is larger than both of them. Actually, in modern flashlights there are mainly just LR41 and LR44; they are analogues of AG3 and AG13, respectively, and have dimensions (length / diameter) of 7.9x3.6 mm in the first case and 11.6x5.4 mm in the second.

— 3R12. Batteries with a voltage of 4.5 V in a case of a characteristic shape: almost square and flat (70x60x22 mm), with rounded corners and two contact plates in the upper part. They were originally created as batteries for flashlights, but nowadays they are used quite rarely due to their large dimensions, shape features and relatively small capacity.

— PX28L. Compact and at the same time quite powerful cylindrical batteries with a nominal voltage of 6.2 V. They are well suited for working with a powerful load, including bright LEDs, but in general they are not widely used, and therefore they are rarely used in flashlights.

— R20. Another name for replaceable cells in size D is, more precisely, for disposable salt batteries produced in this size (other designations are used for other varieties). Usually, flashlights under R20 are compatible with any type D elements, however, the ability to work with salt batteries (having a lower capacity than alkaline counterparts, and even more so batteries) indicates a good energy efficiency and economy of the flashlight.

— CR2. Relatively small batteries (length — 26.7 mm, diameter — 15.1 mm), originally created for compact "soap" cameras — in the expectation that one such element could replace 2 AA batteries. The designation CR2 is commonly used for disposable batteries, batteries of this size are usually referred to as 15270.

— From the cigarette lighter. Power from the car on-board network through the cigarette lighter (or an auto socket of a similar format) can be found in two types of lamps. The first is hand lamps and auxiliary lighting (see "Type") designed for use with or near the vehicle. Most of these devices only work when connected to the cigarette lighter, and a fairly long (several metres) wire with an appropriate plug is responsible for the connection itself. The second option is miniature models (manual compact type and key rings) of “automotive” specialization. Such devices are equipped with their own batteries and are able to work autonomously, and the cigarette lighter is used to charge the battery — and the flashlight body itself plays the role of a plug (in other words, to charge, just insert the device into the cigarette lighter socket). However, both varieties are rare nowadays: in the case of lamps, the wire significantly limits mobility, and in the case of small flashlights, charging from the car network is not so often required. And even in the latter case, a more practical, versatile and convenient option may be a traditional rechargeable flashlight, supplemented by a car charger (see "Complete set").

The capacity of the battery provided in the design or delivery of the flashlight.

Theoretically, a higher capacity allows to achieve greater battery life, but in fact, not everything is so simple. Firstly, the actual battery life will also depend on power consumption — and it can be different even in models with the same luminous flux (this is due to the difference in the characteristics of individual LEDs). Secondly, the physical features of the designation in milliamp-hours (mAh) are such that only batteries with the same nominal voltage can be directly compared by this indicator (in other cases, indicators must be recalculated using special formulas).

In light of all this, we can say that battery capacity is more of a reference than a practically significant parameter. So, in some cases, it allows you to compare different models of flashlights with each other, but only very approximately. For example, a device with a 1600 mAh battery will definitely have a longer battery life than a model with an 800 mAh battery that is similar in brightness, lamp type and “weight category”; but how much battery life will be higher is impossible to say for sure. So, in order to assess the practical capabilities of a flashlight, it is worth focus on more "close to life" characteristics — first of all, on the directly claimed maximum battery life (see above), as well as battery life indicators in different modes indicated in the manufacturer's documentation.