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Dead for passive, but some of these should be fine for active cooling, right? Even for passive couldn't you line up 4 or 5 of those aluminum passive heatsinks on a conductive plate to cool a COB?

Nice. Didn't you hear the greens are useless? ;) But now you know you'll have to add each of those in one at a time, right?

LOL, the circular ones I saw didn't have a big enough pad to mount to.

So is the "secret sauce" filling in the green gap? What's the panel again?

Hey, I got a box of junked heatsinks today too. Not bad for $5. I'm thinking the pair on the back right should work for some CLU048-1212s, no?

I just wanted to thank you all and encourage you to keep up the good work. I joined the forum just for this thread. I am about to start a new lettuce garden under Citizen CLU048-1212s @ 4000k but I don't know if my results will be very useful since I am only using the LEDs to supplement...