Electronics > Beginners
Powering cheap 10w LED from eBay
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skillz21:
I bought some 10w LEDs off eBay for dirt cheap: I got 10 for just over $3, so I had my expectations set very, very low. I did initially test how well balanced they were, and, to my surprise, only two had dead chips, the rest were, as far as I could tell, perfectly balanced. I used one of these balanced ones for the testing that follows.

The seller lists them as 10-12v, but does not list Amps. I tested them today. I set my power supply to 12v, but I was really confused when they only drew just over 200mA. I then tried increasing the voltage until they reached 10w. But, after about the 14v mark, they actually began to dim, and the colour temperature changed. After realising I was going way past the recommended spec of the LED, I dropped back down. After some experimentation, I found that the peak brightness was at around 13.5v, drawing 380ma. I was getting just over 5w, literally half of what it should be.

I guess I got what I paid for. For future reference, can anyone give me some more info about these LEDs, and why they are not actually 10w?
amyk:

--- Quote from: skillz21 on August 06, 2019, 11:22:41 am ---For future reference, can anyone give me some more info about these LEDs, and why they are not actually 10w?

--- End quote ---
Because the seller lied? Also, in case you didn't know, LEDs of such wattage need a good heatsink to run at their rated power --- if you run them without a heatsink, they will overheat very quickly.
skillz21:
Yes, I have a heatsink connected.

So, the seller just lied then. Thanks for clearing that up, I thought that they were such low-quality chips that they wouldn't do 10w.
tszaboo:
You should know, that Chinese watts are less than it is defined in SI. Also hours are shorter there, thats why you can buy 10000 mAh batteries.
Mechatrommer:
just as 2.2lb = 1kg, 10Wch = 4.54545454545454Wsi... the thing is, you get what you pay for... a picture might help, maybe i can get some ;D
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