Comparison LEDVANCE Smart+ WiFi Classic 9W 2700-6500K E27 vs Xiaomi Yeelight Led Bulb 1S Dimmable

Classic incandescent lamps are gradually going out of use these days; mainly halogen, fluorescent and light-emitting diode (LED) models are presented on the market. At the same time , LED lamps of a traditional design can be either white or colored (RGB), and in addition to them, there are models of a rather unusual device - LED with a battery, with LED filaments and phytolamps. Here is a more detailed description of the different types:

— Halogen. A slightly improved version of traditional incandescent lamps. “Halogen” also uses a hot metal coil in a sealed bulb; the difference is that the flask is filled with a special gas containing bromine or iodine vapor. This design increases the service life of the spiral, increases brightness and efficiency, and also provides a more uniform color spectrum. Another advantage of such lamps is their compatibility with brightness controls (dimmers). At the same time, they are not economical, and therefore are gradually losing ground to more advanced types.

- Metal halide. A type of halogen lamps (see above), the luminous flux in which is formed by adding metal halides to the mercury vapor burner. Sodium or scandium iodide are used here as metal halides (special emitting additives)....The burner of metal halide lamps is made of quartz glass or ceramic, and the outer protective bulb is made of borosilicate glass. Such lamps are often used for outdoor and street lighting, in spotlights, etc. As a rule, they emit natural white light, close to daylight.

- Luminescent. A variety known as "fluorescent light bulbs" or "energy saving light bulbs". The bulb of such a lamp is filled with a special gas through which an electric discharge passes; under the influence of this discharge, a special coating applied from the inside to the flask glows. In terms of efficiency, such lamps are inferior to LED lamps, but they are many times superior to incandescent lamps (including halogen), last longer and hardly heat up during operation. Among the disadvantages of fluorescent lamps, in addition to the rather high price, one can note an uneven emission spectrum and poor compatibility with dimmers - for this it is necessary to provide additional control circuits. In addition, the fill gas contains mercury vapor, which is why the lamp should not be thrown into regular trash, and a broken bulb poses a health hazard.

— LED LED. LED-based lamps that produce light of one shade - usually classic white, but there are also colored models. LED lamps are distinguished by extremely low energy consumption (they are several times more efficient than fluorescent lamps and an order of magnitude more efficient than incandescent lamps), high brightness and good color rendering, as well as almost complete absence of heating during operation. In addition, such light bulbs are quite shock-resistant and much safer from an environmental point of view. And in many models, even a broken bulb does not lead to loss of performance.

— LED with battery. LED bulbs with a built-in battery that provides autonomous lighting regardless of the presence of voltage in the electrical network. Such light bulbs accumulate charge in the battery when there is light, and during power outages they use these reserves, allowing them to independently illuminate the room for a certain time. Also, LED light bulbs with a battery can be useful as mobile light sources outdoors, in the garage, etc.

— LED (RGB). A type of LED lamp (see above) that uses colored LEDs rather than traditional white ones - usually three colors corresponding to the RGB color scheme (red, green, blue), hence the name. This allows you to change the color of the lighting within a fairly wide range - from one and a half dozen to several thousand shades. At the same time, such lamps cost accordingly.

— On LED threads. A type of LED lamps that imitates classic incandescent lamps. Such lamps also have a glass bulb, inside of which luminous threads are installed on special supports; the difference is that these filaments are made of LEDs rather than a thin metal spiral. Thus, the lamp turns out to be as similar as possible to a classic incandescent light bulb, while consuming several times less energy; Such models can be useful, in particular, for “retro” style lamps, where standard “LEDs” do not fit well. It is also worth noting that the glow from a lamp of this type covers almost a full sphere - unlike standard LED lamps, which usually have a narrower focus; in some situations this is an advantage.

— Phytolamps are designed to stimulate the growth and development of plants. The products are used for auxiliary lighting: seedlings, cultural and ornamental plants, indoor and outdoor vegetation. They are especially relevant during periods of the year when solar activity is at a minimum level. The light sources are LEDs of different shades and luminescence intensity. White, red, blue, yellow and green LEDs can be collected within one phytolamp. The use of different color shades makes it possible to obtain light waves of different lengths. As a result, vegetation begins to develop comprehensively. Phytolamps are not suitable for the lighting habitual to a person in conditions of insufficient visibility.

The power consumed by the light bulb during normal operation. The lower this indicator, the more economical the model and the cheaper it will cost to operate. In traditional incandescent lamps, the brightness of the glow also depended on the power, however, different types of lamps are presented on the modern market, with different efficiencies. Therefore, it is possible to uniquely link the power consumption and brightness only in lamps of the same type (see above), and to compare different types of models, you need to use the LON analogue (see below).

A parameter that describes the brightness of the lamp compared to a general purpose lamp (LON — a conventional incandescent bulb). Simply put, an analogue of LON is the power of an incandescent lamp, which is equal in brightness to the model in question. For example, a 75W LON analogue means that the lamp glows as brightly as a 75W incandescent lamp.

This parameter appeared for the convenience of evaluating and comparing different types of lamps in terms of brightness. Data on the luminous flux say little to the average user, and it makes no sense at all to evaluate the brightness by power — different types and even different models of lamps of the same type can differ markedly in efficiency. On the other hand, many users are accustomed to dealing with incandescent lamps, and comparison with such a lamp is familiar and understandable to them. In addition, the LON analogue allows you to compare different types of lamps, and it can also be very convenient when replacing incandescent lamps with more economical ones: for example, if 100-watt lamps were used in the chandelier, then the new lamps must have an LON analogue of at least 100 W — otherwise they may be too dim.

The conditional "amount of light" produced by a light bulb in normal mode. The higher the luminous flux, the brighter the light and the more clearly the illuminated scene will be visible. Note that lumen values are used primarily for special purposes; in everyday life, the estimation of brightness by the analogue of LON is more popular (see above), and here the ratio is as follows:

— 40 W analogue LON corresponds to a brightness of 370 lm;
— 60 W — 550 lm;
— 75 W — 800 lm;
— 100 W — 1200 lm;
— 150 W — 1900 lm;
— 200 W — 2700 lm.

Note that the principle "the more the better" in the case of the brightness of light bulbs is not always applicable. And the point here is not only energy consumption: too bright light is harmful to the eyes, leads to rapid fatigue and psychological discomfort.

This parameter describes the general coloration of the light of the lamp in "warm" or "cold" tones.

Initially, colour temperature is the temperature (in kelvins) of an object at which it begins to glow in a certain colour. Interestingly, the higher its value, the more “cold” the colour is: for example, the dull red glow of a heated metal corresponds to 800-1000 K, and the bluish-white tint of a fluorescent lamp corresponds to about 6000 K.

The temperatures encountered in modern light bulbs can be described approximately as follows:

2700 – 3000 K — "warm" white light, similar to traditional incandescent lamps;
3000 – 3500 K — "slightly warmer than average";
3500 – 6000 K — neutral white, similar to daylight;
More than 6000 K — cold shades of white.

Note that the colour temperature is not directly related to the quality of colour reproduction provided by the light of a particular lamp — much depends on the features of its design and, accordingly, the spectral colour balance.

The angle of light dispersion is the space in front of the light bulb, which is illuminated by the source itself, and not by the light reflected from the walls and interior items. In other words, the angle of light scattering determines the zone of the best illumination. Classic incandescent bulbs demonstrate the widest dispersion angle — they shine almost 360˚. LED spotlights have the smallest illumination angle, which are able to illuminate well only the area directly under the bulb — the scattering angle in such cases is about 15˚. Of course, a large angle of light scattering is not always needed. Working in the evening at the table, you need light only in front of you, so as not to disturb anyone. For spotlights that light up only small objects in front of them (a painting, sculpture, bas-relief, etc.), the scattering angle can even be from 4 °. As for the top (general) lighting, in this case it is better to choose something with a wider dispersion angle. These bulbs provide extremely uniform illumination.

Apple HomeKit -enabled light bulbs are compatible with software used in Apple's smart home eco-system. First of all, thanks to this, the operation of the light source can be controlled from an iPhone, iPad / iPod or even a MacBook. The HomeKit application opens up fairly wide possibilities for setting up lighting modes, allowing the user to change the colour shade and intensity of the light bulb, programme its operating time, etc.

The device supports the ability to integrate with the Google Home smart home eco-system, as well as control from smartphones and tablets with the Android operating system. Using Google Home, you can easily and easily adjust the glow parameters: colour gradient, luminous flux, operating time, etc. Proprietary software allows you to create profiles with preset glow parameters — this can be a profile for workflow, relaxation, watching movies, etc. Distinctive A feature of the Google Home system is the presence of the Google Assistant voice assistant.

The operation of light bulbs with voice assistant support can be controlled using voice commands. The most widely used voice assistants are Apple Siri, Microsoft Cortana, Amazon Alexa and Google Assistant. Most often, the voice assistant interacts with the Smart bulb through a special application. This can be Google Home, Apple HomeKit, etc. That is, the user sends commands to the software on his portable computer/mobile device.