Comparison Ferei W151B vs Ferei W151
Add to comparison |  |  |
|---|---|---|
| Ferei W151B | Ferei W151 | |
from $82.40 up to $85.40 | from $78.06 up to $85.40 | |
| TOP sellers | ||
| Type | for diving | for diving |
Specs | ||
| Lamp type | lED with reflector | lED with reflector |
| Peak luminous flux | 650 lm | 800 lm |
| Lighting range | 300 m | 300 m |
| Brightness levels | 3 | 3 |
Power supply | ||
| Power source | 1х18650 | 1х18650 |
| Operating time (Low mode) | 5 h | 5 h |
In box | ||
| In box | strap | strap |
General | ||
| Shockproof |  | |
| Water protection | + | + |
| Material | metal | metal |
| Length | 15.3 cm | 15.3 cm |
| Weight | 227 g | 227 g |
| Color | ||
| Added to E-Catalog | november 2014 | november 2014 |
Compare Ferei W151B and W151
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Glossary
Peak luminous flux
Luminous flux (measured in lumens) can be described as the total amount of light produced by an LED or other light source and emitted in all directions the source shines by itself. In practice, this means a flashlight’s capability depends not only on luminous flux but also on beam angle. For example, a relatively weak flux can be concentrated into a narrow beam to achieve good throw; while effectively covering a wide area will inevitably require a large number of lumens.
Peak luminous flux is the short-term maximum brightness a light source can deliver with a fresh battery and low temperature, usually in Turbo mode. It’s used to gauge instantaneous burst output. Unlike sustained (long-term) luminous flux, the peak lasts seconds or minutes and then drops due to heating down to High mode, so for real-world use it’s more important to understand how many lumens a flashlight can maintain steadily. You can see this with EDC models: a stated 2000 lm is impressive for a quick outdoor search, but for a long walk the device will switch, say, to 1000 lm, keeping a comfortable body temperature and solid runtime.
It’s also worth keeping in mind that high flashlight brightness is far from always justified, and you should choose this parameter based on real conditions of use. At short distances, very bright light can be a hindrance: it tires the eyes and can dazzle people nearby. In addition, increasing brightness usually requires more powerful sources of both light an...d power, so the flashlight’s weight and overall dimensions go up.
Peak luminous flux is the short-term maximum brightness a light source can deliver with a fresh battery and low temperature, usually in Turbo mode. It’s used to gauge instantaneous burst output. Unlike sustained (long-term) luminous flux, the peak lasts seconds or minutes and then drops due to heating down to High mode, so for real-world use it’s more important to understand how many lumens a flashlight can maintain steadily. You can see this with EDC models: a stated 2000 lm is impressive for a quick outdoor search, but for a long walk the device will switch, say, to 1000 lm, keeping a comfortable body temperature and solid runtime.
It’s also worth keeping in mind that high flashlight brightness is far from always justified, and you should choose this parameter based on real conditions of use. At short distances, very bright light can be a hindrance: it tires the eyes and can dazzle people nearby. In addition, increasing brightness usually requires more powerful sources of both light an...d power, so the flashlight’s weight and overall dimensions go up.