This debate (basicly, on whether the human eye is peak or average sensitive) has happened here several times now - see the archives... I don't recall whether it has ever been mentioned whether there's a difference between viewing the light SOURCE, vs trying to illuminate a 'scene' with the output from the LEDs. I'd suspect that in that latter case, peak output would become less significant compared to average output. BillW -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu