hi im looking for some help building an ir led array i have about 140 10mm IR leds to power and i need to be able to do it from batteries... hi im looking for some help building an ir led array i have about 140 10mm IR leds to power and i need to be able to do it from batteries the leds claim to have the following spec: RADIANT INTENSITY 6mW/Sr If=20m/a RADIANT INTENSITY 30 mW/Sr If=100m/a FORWARD VOLTAGE 1.4—1.45v REVERSE CURRENT 10u/a i tried running 48 from 2x pp3 batteries in series but the current draw killed the batteries pretty quick and their internal resistance caused them to get pretty hot... pretty much the same results running a string of just 6 with two pp3's in series powering them. though they did last a little longer at the mo i have sets of six leds in series i need a pretty portable solution that offers as the best possible brightness fron the arrays and needs lolast for about 1-2 hours so which batteries to use? how many leds to connect ? series/parralel? additional resistors? thanks in advence guys
