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.
I bought predrilled heat sinks, so I’m stuck with them.
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 heat sink would be better. The Light is good according to the light meter app on my phone whatever that means. The light is almost full color spectrum and at 18" it’s 25,000 lux. I can’t afford a good PAR light meter right now. I just got a cheap sunlight meter today that’s supposed to measure PAR. If it doesn’t work I’m only out $14.