SP36 ~130W boost driver (next to a 17mm driver), with USB charging :
It uses the same boost controller as the single cell driver above, with larger FETs and better inductor (only 0.420mΩ !) for more power/efficiency.
I couldn’t test 20A at 4Vin with my power supply, for 3Vin at high current I used two A123 20Ah LiFePo4 cells.
I used 2700K and 5700K XHP50.3 HI 90CRI :
I replaced the switch with a longer travel, quieter one, I had a switch PCB+RGB from another mod that roughly fits :
Originally the switch red+green LEDs served as charging indicator, but since I put Anduril RGB there I aded LEDs visible through the USB port gaps :
So as expected it’s very bright, I haven’t measured the original current with the SST-40 but considering the LH351D version draws ~16A with sofirn cells, I’m guesstimating 25A max with SST-40 and good cells, about 85W, with my boost driver I get about 50% more power, altgough being high CRI and neutral white once mixed it might not be much brighter, of course being a boost driver it can deliver full power until the cell are depleted whereas at half SOC the original direct drive driver only allows a little more than half the current.
It’s also quite throwy, unfortunately there is a small blue spot in the middle of the main spot that is quite jarring, the reflector being smooth I feared something like that might happen, @Haukkeli said that it could be bad focussing and indeed the reflector is quite high above the LEDs, even without the centering gaskets the actual reflector part starts ~1mm above the LEDs, maybe even a bit more, not sure yet what I’ll do about this, an OP reflector would be ideal of course.
Regarding USB charging, I misread the datasheet and thought it could take advantage of higher voltage adapter (9V1.66A) from Samsung/apple to charge at 15W, bjt nope, only 5V2A, which after losses in the cable and charger is more like 9W charging.
It also support USB OTG with 1.5A reverse boost, although I haven’t tested that yet.