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These are 36V COBS, significantly underdriven, as you guys guessed. I used thermal grease as you would a CPU and I took the oxidation off the raw aluminum heatsink before applying grease or COB. For part of the time during grow, I had a resistor on the control leads of the power supplies to drop...

Hi All, I recently completed a harvest and results were great. My DIY cob light has been functioning flawlessly the entire time. Yesterday, the light was functioning normally. Today, 1 light bar is out completely, the other two are flickering and drawing a measly 70 watts combined. I'm confused...