someone needs to explain all this premium q5 stuff. why are there two different models with the same bulb and battery? why don't i settle for a $20 1 watt aaa led? or my photon? soled?
Mag, check out
http://www.lumileds.com/pdfs/ab21.pdfThis app note is for Lumileds (Luxeon) but applies in principle for other LED makes as well.
