Also, check out Blue LED dawn simulator for Soleil Sun Alarm.
Step 1: Why blue light?
Step 2: Materials
Luxeon III Stars, (Lambertian) 3 blue (470 nm), 3 royal blue (455 nm) - Luxeon.com
BuckPuck 700 mA driver (03021-D-E-700) - TheLEDLight.com
30 volt DC power supply - RadioShack
1/8 Mono phone jack and plugs - Radioshack
lying around the shop but available at RadioShack or Jameco:
1/8 thick aluminum sheet approximately 8 x 10
#4-40 nylon screws and nuts
Step 3: Rough cut and drill holes in aluminum base
Cut the aluminum to size and mark where you want to mount the LEDs. I printed a template on paper and used it to mark where to drill mounting holes.
Step 4: Round edges and sand
Step 5: Bend the aluminum base
Step 6: Cut mica
Cut thin pieces of mica, which is thermally but not electrically conductive, into the shape of the LEDs. I used a laser cutter, but you can also use the mica's existing shape and carefully drill holes to fit the LED's screws by starting with very small drills and working your way up.