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

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.