i used this. http://www.dealextreme.com/p/flood-t...nt-3-aaa-26800

awesome light for the price ( i bought 2). even brighter than my Stella Light and Motion 120. may i also say that the built quality is excellent. recently i bought 2 Cree flashlights from eBay claiming to have a 300L but nowhere it is near this light. avoid those Cree lights they are selling @ eB... not worth it. in fact i also bought the headlamp thinking i can put it on my helmet - and same crappy workmanship. dealextreme is pretty good.