✌ FREEME - ASTROLUX MF01S 15000lm Flashlight Group Buy - ENDED

[adam7027]

@Texas_Ace

In my testing the 3 channel vs 2 channel efficiency difference was not nearly as much as many people used to think.

That said the 3 channel will have a fairly small window in the low/midrange where it has a bit of an advantage simply because it has a channel specifically designed for that output level.

At other output levels the only real difference is the input voltage.

Honestly there it is not even worth talking about driver efficiency. We are talking about a ~10% change in efficiency one way or the other depending on the exact output level. Considering the LED’s have a tolerance of 12% themselves there are simply better things to worry about.

I think, that if the second channel could be more powerful, the difference in the efficiency (both output and heat wise) could be worthful. For that many emitters (18), I think, 7×7135 is not enough - something like FET + 15 (or even 24) + 1 (or 2) could be better, as it would let the emitters run still fairly efficient on the mid-high output levels.

I took a look at maukka’s output test for SST-20 4000K, and with ~0.5A per LED, that is about 120 lm/W.

If I count 40W for a 18650 battery, and I multiply it by 4 (160W for the whole battery holder), then I divide with 18, that is still almost 9W per emitter, which is maybe around 2.6A per emitter, when I only calculate with the FET channel, and that is less than 80 lm/W then.

Maybe the XP-G3 variant could be driven harder with more efficiency, but I think, it would worth to design a 3 channel driver if SST-20 is also considered.

I know, that placing so many 7135 on the driver board would be difficult, but I think, a triple channel FET + 24 + 2 driver would be a very good fit for the MF01S.