Some ppl are saying you can DD this led (1mm) and some are saying you can’t. I’m really confused. If I use a keeppower protected 3500mah in a GT mini how much current will it draw?
for DD the current with full cell needs to be below 4.5A, so some older cells like NCR18650B with PCB may do only 4.5A when full
also you may try to solder simply a 1W 47mOhms resistor on each contact on the MCPCB to get the current limited
The GT mini Manual mostly copied from the GT manual and Lumintop made a mistake that they written buck driver. It is not a buck driver. it is a fet+7135.
LED obtained from Led4Power on a 20mm copper MCPCB.
LED heatsinked on a Coolermaster GeminII S CPU cooler with a 120mm corsair SP fan at full speed.
Thermal Grizzly Conductonaut liquid metal used between the MCPCB and heatsink.
MCPCB tightened down with two screws.
Luxmeter is an LX1330B.
Distance from LED to luxmeter measured with a UT393B laser meter at 1m +/- 0.01
Stray light from LED blocked using Edmund Optics flock paper to avoid reflections.
Current was monitored with a UT210E clamp meter.
Power supply used is a DPS5020, also used for the voltage readings.
Die area used for calculations is from datasheet, 1.03mm x 1.03mm
Results:
Very impressive LED under extreme cooling.
Peak reached at ~5.6A, would not recommend going this high in a flashlight host.
Should be close to 700cd/mm^2 with an RLT collar, if I feel like it I might redo the test with a collar on it.