Driving a Cree XHP70.3 with a single cell

[EasyB]

What is your custom light? Can you use multiple 3V emitters in parallel instead of just one?

An LED has a relationship between current and voltage. See, for example, below link for some tests.

Luminus SFT40 test

[image] [image] Here is one that needed testing because I want to use it in a mod. The Luminus SFT40 is like the dedomed version of the SST40, but it did receive a unique new design with the 4 bond wires that end in cut-off corners of the die. So expected is that bond wire failure is less likely to happen. I got my SFT40 leds from Simon’s store ( link ), he lists the full partnr. as SFT-40-WCS-F50,N5-BC-VJ, so the output bin is N5 which is cool because that is the same bin as most domed SST40…

A rough example of how this might work is if your cell provides 15A at 3.2V, it would drive 3 SST40 LEDs at 5A each.