[Laser] Re: Laser Digest, Vol 12, Issue 9

Tim Toast toasty256 at yahoo.com
Fri Apr 15 22:23:24 EDT 2005


here's a nifty LED circuit calculator page:
http://metku.net/index.html?sect=view&n=1&path=mods/ledcalc/index_eng

I think it's pretty much standard for most leds to use
20 - 30 ma at their rated lifetime. And at a voltage
drop of 2 volts for red diodes. 
Here's one type of 3000mCd diode specs:
http://www.techmark.nl/epitex/products/l660_u.htm


> 
> Are all LEDs rated at a 20mA draw which is what I
> see in all the
> manufacturers specs?  I have three dozen 3,000mCd
> red LEDs but no specs.  If
> I run them off of 12V with about 1200 Ohm
> resistance, I get a current draw
> of 15mA and an input voltage of about 1.8V.  I can
> lower the resistance to
> increase current to 20mA and thus the brightness,
> but I'd rather run them on
> the safe side.
> 
> What is the proper procedure for determining
> voltage\current of the average
> LED?
> 
> Kurt
> 
> Rosetta Proving Ground, Nevada
> Hell's Laboratory
> 
> 
> 
> ------------------------------
> 
> _______________________________________________
> Laser mailing list
> Laser at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/laser
> 
> 
> End of Laser Digest, Vol 12, Issue 9
> ************************************
> 



		
__________________________________ 
Do you Yahoo!? 
Plan great trips with Yahoo! Travel: Now over 17,000 guides!
http://travel.yahoo.com/p-travelguide


More information about the Laser mailing list