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DIY driverless COBs test update

I’ve been running a test fixture with 110v AC 50watt full spectrum driverless COBs for about 10 weeks. I am working on a 800 watt light and I am learning what I need to build a reliable and cool light. [1507941851442-808664165] I bought predrilled heat sinks, so I’m stuck with them. [IMG_20171014_150120568] When both lights are running with no cooling they get to 200°F. With cooling fans blowing 25cfm on them, temps are around 120°. I have had 2 lights fail due to high temps. A much bigger …

How many of you growers are using driverless COBs

I’ve been using these cheap “full spectrum” Chinese driverless COBs for a while in a test setup. They don’t have the high intensity that the more expensive DC voltage COBs, but they can be moved closer to the plants without harming them. Surely I can’t be the only one using these. The only info I can find about them is they put out a good light spectrum for flowers.