Ok this is my scheme for the saber with 64 blue leds
4 x strings of 16 leds for a total of 320mA each string (@3,4v)
4 x Constant Current Regulated LED Driver 320~350mA (8~30V Input but with minor modifications even lower)
MR16 1*1W 320~350mA (8~30V Input)
http://www.dx.com/p/mr16-1-1w-320-350ma-constant-current-regulated-led-driver-8-40v-input-13553#.U0lP_1cXJ7Q
4 x transistors PN2222A (0.8A - 40V max)
4 x 220 ohm resistors
