Space heater?
Here goes my first post in this forum.
I have some experience with those flashlights. They are assembled as 3 parallel sets of 3 LEDs in series. As the OP stated they only draw about 3 amps with 3 fully charged 26650s. As expected the output is somewhat disappointing.
I re-soldered the wires that power the LED module to the driver board so that they completely bypass the circuitry on the board and supply the full voltage of the 3 cells to the LEDs. In this configuration the LEDs draw about 6.5 amps. The wires (original) that connect to the LEDs to the driver are very small so I'm sure they help control the current as to not over-drive the LEDs. With this mod drawing about 80 watts the light output is very good but of course it is only 1 mode.
I made an auction bid of $34 for another of these flashlights, not expecting to win of course. But win it I did anyway.
After drilling and tapping at 1/4-20 through the heads about halfway up the fins, I ran all-thread through the holes with a nut on each side to lock the all-thread in place. I then drilled another hole through side of the heads at the base where the tube threads are and ran the power wires through there, soldering them to the small LED feed wires inside the head. After sealing the tube hole with epoxy and wire hole and all-thread with silicone I used the all-thread to mount the pair in the grill of my SUV.
I wired these lights to come on with the high beams. They draw about 7 amps each at 14.4 volts with the engine running which is about 100 watts each. As you can imagine they absolutely blow away the 50 watt HID headlights. I have been using them for about 6 months and probably about 20 hours run time. I only use them for any length of time when the car is moving and thus supplying good cooling air flow to the fins. They haven't burned out yet.
