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57% OFF 10pcs 3W LED Lamp Bulb Chips 200-230Lm White/Warm White Beads 3.2-3.4V 4,36€ 10,14€ View It

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Jayson 09/05/2015

I have not been able to find any legible manufacturing data markings on these, but they seem to conform to the following generic LED bead characteristics of other products listed on the internet: 3.2-3.5 Volt drop 750-800mA current To design a custom circuit, you can put in those parameters into the LED calculator web page (below) and get a sample circuit and required parts list for different DC voltage driver units: http://ledcalculator.net You will likely need heat sinking for the LED if you run it at the rated capacity of 3W. I am designing a custom lighted sign for my cabin, and am getting suitable brightness (for my purposes) using a 12VDC supply, 2 of these LED beads in series with a 75 ohm current-limiting resister (1+ Watt rating)... This runs cool to the touch without heat sinking, but note that it is WELL below the rated capacity of this LED. A similar circuit running at rated capacity would use a 4+ watt, 6.8 Ohm current-limiting resistor vs the 75 Ohm one I am using. The polarity (+/-) of the bead is stamped on the soldering lead... it's tiny, but there.

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maurits Jayson, thanks very much for this very useful info!!
Reply 08/06/2015

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