A super bright white light facing the rear is not legal. It could also cause visibiltiy issues as drivers may not be able to see what is in front of the light. Retro-reflective material and flashing lights (amber to red in the rear) are your best freind. The human eye was not designed to see at night. Also, take a look at this and it may help.

http://www.visualexpert.com/Resources/pedestrian.html