Originally Posted by
thelastrebel
Hmm if they take 220V AC then they must effectively have drivers built in, hence the 'driverless' tag. I'm no expert but that all seems a bit sketchy to me. Not sure how much advice I can give on choosing COBs I'm afraid as it's been a couple of years since I looked at them, but I definitely wouldn't want AC current right up to the light itself if jt was me!
For heatsinks, the problem you'll have is that the heat is generated over a much smaller area - if one chip is 50W compared to something like 1-2W each for mid-power diodes, sheet metal almost definitely won't cut it. Most COB builds use something roughly along the lines of CPU heatsinks, but what you need will depend on the power of each chip. If you're looking at mounting them to sheet metal have you thought of strips instead? At some point though the cost won't be any cheaper than just going completely DIY...
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