Now that I realized that the smallest Version of the Beamboarder is ideal for skating around here some more pictures. Use some adhesive between the magnets to increase the heat transfer :

An small package of high power light. In the details you will find more informations about the how to build your own optic.

The material you will need for crafting the battery pack:

You can shrink all together with a lighter:

The voltage will stay at arround 9V and gently drop down. This is the perfect voltage for your LED.