LEDs intensity solutions?
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Posted by Vlad on August 4, 2007, 7:18 pm
Please log in for more thread options Which one of these three solutions is the best for the best light intensity? http://img329.imageshack.us/img329/5950/solucijenw2.jpg More info: source voltage - 12V diode forward voltage - 3.7V diode forward current - 20mA number of LEDs - 23 (blue, 470nm) | ||||||||||||||||||||||
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Posted by Stephen J. Rush on August 4, 2007, 7:42 pm
Please log in for more thread options On Sun, 05 Aug 2007 01:18:55 +0200, Vlad wrote: The light output from each LED depends only on the current through that LED, so I would just minimize the number of series strings to get the parts count down. The light intensity from the whole array will depend on the physical arrangement of the LEDs and what kind of optics you put around them. | ||||||||||||||||||||||
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Posted by Don Klipstein on August 4, 2007, 9:26 pm
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>Which one of these three solutions is the best for the best light intensity?
> >http://img329.imageshack.us/img329/5950/solucijenw2.jpg > >More info: >source voltage - 12V >diode forward voltage - 3.7V >diode forward current - 20mA >number of LEDs - 23 (blue, 470nm) I prefer the one with 12 series strings, 11 of them having 2 LEDs. The third solution using 8 series strings, mostly having 3 LEDs, I consider likely problematic since LED current will vary greatly with small variations or changes in LED cvharacteristics and with small variation in supply voltage. - Don Klipstein (don@misty.com) | ||||||||||||||||||||||
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Posted by Vlad on August 5, 2007, 6:17 am
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I also didn't mentioned that SOL.1 array draws current of 460mA, SOL.1 240mA and SOL.3 160mA. So if intensity of all three is the same then it's the best to pick one that will minimize the current draw, am I right? Probably second solution is the best because Stephen J. Rush mentioned that the third one could be problematic. | ||||||||||||||||||||||
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Posted by Vlad on August 5, 2007, 6:19 am
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One mistake; second SOL.1 should be SOL.2... SOL.2 draws 240mA. | ||||||||||||||||||||||
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> http://img329.imageshack.us/img329/5950/solucijenw2.jpg
>
> More info:
> source voltage - 12V
> diode forward voltage - 3.7V
> diode forward current - 20mA
> number of LEDs - 23 (blue, 470nm)