100W (Warm White 3200K+Cold White 6500K) Double Color Led SMD COB Integrated Light Source, Led Beads, Led Chip, Led Lamp Bulb for LED Stage Lights

They work well- although be ready because they emit a massive amount of heat. The light output can be a little inconsistent but it’s a budget diode.

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My husband replaced a security light bulb in a light that was 6 years old. He had to do a little soldering to make it fit and it works perfectly. It's bright just like we want.

Without a proper heatsink, this COB can't possibly work. What is the proper heatsink ? I do not know. I took my best attempt at it with what I though was a thorough heatsink, it worked brilliantly for about 2 minutes ... truly excellent ... then failed. The vendor should not sell this without proper instruction regarding heat sink or should sell it with a heat sink.

The RGBW version doesn’t include the constant current ma requirements and thus - it’s tough to figure out the proper driver

I am an Electrical Engineer and I was very careful to build and pretest a jig to test this unit. I used that jig to test another high power LED that worked just fine. I soldered all the wires correctly and it doesn't work. NOTE that I answered a question about this device saying it had >200,000 lumens, but I was confused and thought the question referred to another high power LED I purchased which did work and I don't see how to delete the answer. Unfortunately I found out the device did not work 5 days after the return period. I note that the seller mainly sells office chairs, so I doubt they will get back to me on this. If they do, I'll modify my rating. If not it stays one star.

There's no driver and I don't sell one or offer one so you got to go look at other stores

These 200w led is extremely bright I look forward to using this led.