http://www.dealextreme.com/details.dx/sku.14909

runs of 2 aa's. is very cheep(get 5 ) and puts out about 150+ lumens. i use one of these(well its an older one modded to make this same light) and it gives me more light than i have ever needed.

i would recommended the scc p7 also, but soon cree is going to put out a four die kile the p7 emitter that will KILL the p7 in turms of brightness and efficiency, you will be able to get the same 400 ish lumen's out of the cree at 1 amp that you get at 2.8 amps with the p7, so i am holding out for them.