DiY LEDs - How to Power Them

Is it possible to test the cobs without mounting to a heat sink? I'm not sure when I will have to time to get this light fully constructed but I wanted to verify that the CXA's would at least fire up, just for a second or so. That way if I had issues with any of them I could notify the seller before it was too late to do anything. Also like many others on here I am planning on using the Arctic cpu coolers, if these fans go out will the heat fry the CXA with a max 1.4 mA or will the sink be enough to dissipate the heat without a fan?
 

grouch

Well-Known Member
Im having a hard time finding the right driver for my far red epistars. The vf is 1.8-2.1v and I would like to power three of them for 5 minutes at 700ma. Anything easily available in that range?
 

SupraSPL

Well-Known Member
Good catch I didnt notice that. The description model number indicates 1050mA. I will email the seller to verify which one it is.

When I tested the 700mA version I was somewhat disappointed with the efficiency (88%) with one CXA on each channel(34Vf). As you can see the 700mA version goes up to 57V. Maybe the efficiency would improve if I pushed it closer to max but testing that was kind of a pita so I didnt bother. It needs to have every channel loaded in order to operate. Anyway, it would be easier to run the 1050mA version closer to max to find out the efficiency.
 
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