got me some of these leds http://www.ledrise.com/leds/5mm-leds/p441/nichia-5mm-white-led-44000mcd-15-20ma-nspw500gs-k1-w-b1-b2/
and put them in some of the cheap light from DX http://img.dxcdn.com/productimages/sku_0824_1.jpg
the result is very impressive for a keychain light