Finally finished my second project and I'm pretty happy with the results...
The design is mostly based on the information found here:
45 LED's running off of a 6 volt AA battery pack or wall wart. Either one plugs into the coaxial power jack on the back.
I decided to keep the battery pack off the light so that it wouldn't add extra weight when using the camera handheld. I just pop the battery pack in my pocket when shooting. It could just as easily be mounted to the light, camera, or tripod.
The knob on the back is a dimmer. The range is from full brightness down to about 10% or so.
I opted for warm white LED's because the light isn't powerful enough to use outdoors, so no need for daylight-balanced.
The Velcro around the edges allows me to attach my LumiQuest Softbox if I want more diffusion...
LED's - http://buy-leds-online.com/530.html
--WARM WHITE LED 530MWO4C
--Vf(Typ) = 2.8 Vf(Max) = 3.4 lv(at 20ma)
--mcd = 6000~12000
--Half intensity angle = 24°~30°
Project Box (4" X 2" X 1") - Radio Shack - 270-1802
4AA Battery Holder w/ Switch - Radio Shack - 270-0409
Size M Panel-Mount Coaxial Power Jack - Radio Shack - 274-1582
Size M Coaxial DC Power Plug - Radio Shack - 274-1569
33 Ohm Resistors - Radio Shack - 271-1104
250 Ohm 5 Watt Pot - www.digikey.com - CT2155-ND
Blue Insert Control Knob - Radio Shack - 274-403
Metal Shoe Mount - www.markertek.com - DELV-CM