I've done all sorts of messing around with LEDs and flashers and such for brake lights and I have to say that the most effective and easiest way to upgrade your brake lighting is to add a Lite-Blazer 56011 (http://www.run-n-lites.com/prod-LiteBlazer.asp).
(http://www.run-n-lites.com/images/LiteBlazer.jpg)
(http://i278.photobucket.com/albums/kk91/electro_handyman/Bike%20Tech/licframe.jpg)