I have a question, which is a sincere question. What is the purpose of anti-reflective coating on our flashlight lenses? Is there some kind of glare that it eliminates ? If so is it glare on what we are lighting up or from the lens itself?
To my knowledge, it is used in order to get more light through the lens. Otherwise, some of the light would reflect back into the flashlight itself instead of going out the front. A lot of AR lenses are claimed to have ~99% transmittance. Uncoated glass is less. How much less, I’m not sure (maybe 5% less?).
The point is the driver board, which is not a FET, but a constant current. As long as the driver board is completed, the rest of the work will be done quickly.
The manufacturer has done samples three times, but each time the samples are done, it turns out that it is very difficult to purchase chips. The supply of chips is extremely unstable this year.
I want to temporarily remove the reverse charging function.
Have you thought about developing flashlights with dual diodes and dual batteries? For example 2*LH351D/2*14500 or 2*50XHP/2*21700 and many other options.
I have already seen many such inexpensive flashlights on Aliexpress, apparently there are factories that can make such cases from aluminum at an affordable cost.
Well, the below example is same light same distance, both lux meters are brand new. I have measured against the Extech another 6 light meters (less and more expensive) and all are measuring minimum 20% higher, nevertheless none of them measured as high as the Uni-T. And the funny thing is, that the laboratories I managed to find are proofing the lux meters, but only with standard light source (not LED) only up to 1000 lux, while the Ex-tech only has data for LED. Measuring lumens is easy with Maukka lights, but throw is confusing for me with such differences. Any ideas how can I narrow down the results?
I got the same L21B (CSLNM1.TG, 12-group driver) and the driver looks similar to the one in your picture.
Using UT210E clamp meter, and with a fully-charged 21700 battery, I measured up to 5.4Amps tailcap current (not 6 Amps).
I'm not sure if this is the 5Amp or 6Amp driver. The box label indicates "5A 12-group" though.
Beamshot of the Convoy L21B (Osram CSLNM1) (5 Amp driver? - although I measured around 5.4 Amps max tailcap current when using a full charge battery)
for reference, this is the how the scene looks during daytime