CHANZON 10pcs High Power Led Chip 3W Warm White 3000K - 3500K (Input 600mA - 700mA / DC 3V - 3.4V / 3 Watt) Super Bright Intensity SMD COB Light Emitter Components Diode 3 W Bulb Lamp 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...

I've been critical of some Chanzon LED's for not performing to their rated spec's but these units actually do quite well near their max rating and priduce less waste heat at optimal output than I expected. I used them in a DIY EPAR LED grow lamp and they are all still running just like new after a full year of use.

good quality , very useful for night light..

普通の商品でした。

定格の半分程度の電流300mA程でも、放熱板とかで放熱しないと熱暴走をおこしてして壊れます。定格600mAともなると理論上４倍以上の相当な放熱器の対策が必要です。

Good value for the price but never believe the maximum power claims on these devices, they're almost always a lie. I would not recommend running any of them at their claimed max power rating because there seems to be some issues with this supplier mixing and matching their 1W and 3w devices to some degree or offering lower quality dies mixed in without downgrading the overall rating. For the most part I've been satisfied with their performance for the price I paid but just don't expect 3W rated dies to actually run at 3W without seriously reducing their operating lifespan. I can safely run all the 3W LED's at 2W but no matter how good the heat sinking is, they will build up too much heat on the die at 3W and cause damage to the lens, the adhesive and the phosphor layer. Fair warning. You can tell by looking at the bottom. True 3W dies have a heat pad the entire diameter of the ceramic die and the 1W units have a heat pad smaller than the die.