CHANZON High Power Led Chip 100W White (6000K - 6500K / 3000mA / DC 30V - 34V / 100 Watt) Super Bright Intensity SMD COB Light Emitter Components Diode 100 W Bulb Lamp Beads DIY Lighting

These are the best COB's at this price point in my opinion. I thoroughly tested all my COB's at low voltage (About 25V) All the LED's on all 4 of my chips light up at exactly the same voltage. On 100W COB's 10 rows of 10 LED's. That's 400 individual LED's working exactly as expected! These things are impressive. I would love to see someone with a proper light meter compare these to the CREE's and the Vero29's If you want good LED's without spending £20+ a chip these are amazing for the cost. They seem amazingly bright to me but it is hard to tell without a PAR meter or the like DO NOT get the cheapo ones they are not worth the plastic they are moulded in...

no issues, just watch the power source as its on 2v max

very bright for a 50W - I replaced a 100W failed chip and it seems just as bright . (Using a 50W driver). Works well and appears to be good quality.Don't forget to use heat-conducting grease if you replace an LED, or it may burn out.

White (6500K) 50 watt COB LED is as advertised and price is very competitive. However item wasn't delivered by estimated date - almost a week later before it arrived. Hence 4 stars.

The LEDs seem very well balanced, and all start glowing at the same time when I slowly ramp up the current, and I'm very impressed by the light output this thing produces. The back is also coupled quite well to the LEDs thermally and allows me to pull the heat out of it pretty effectively. You definitely don't want to run this without a good heatsink and when it's on you should absolutely not look at the front of it.

So far, so good. Nice drop in replacement for the cheap 30w led Chinese security lights. The light I have had holes predrilled and tapped the same dimensions as this heat sink mount, even though they weren’t originally used - you might get lucky with your light. Item was sent from China and forwarded on from UK address. (Could see my details on the Chinese label under the Royal Mail label)

I got these to make a safelight for B&W darkroom printing, and at 600nm they are well outside of the Ilford paper sensitivity range. Providing they are not run at full brightness, 4 of them at a two metre distance (as recommended) provided 10 mins of light before fogging started to set in (Always do a proper safelight test for yourself before using for real though!). Safelight built into a small transparent box with an Anker USB Power Bank supplying power via a little buck converter, a 5,000mah supply lasts around 6 hours, by which time I need a break anyway!

Both chips have now failed after 5 months use as a nightime foodlight. Bought and fitted to replace chips in a 100w floodlight, with heatsink, and good quality of thermal paste used. Pretty unimpressed. I have 2x 50w chips to replace the same in a floodlight which has chips (7+ years old) beginning to fail. I'm not sure i want to go to the hassle of changing these for the chanzon chips if they are going to offer a similar lifespan...