I use a mil-spec microswitch activated by the left brake lever to control my brake light. It's compact, simple, rugged, reliable and a great conversation piece. However, it isn't cheap. The microswitch alone cost $50. See attached images.
Last edited by Frankenbiker; 06-24-07 at 06:32 PM.
Busch & Mueller, a German company, makes a DIWA (Distance Warning System) light that gets brighter when you slow down or stop.
Check out their website: http://www.bumm.de/index-e.html?docu/diwa-e.htm
They make very good products--I have one of their regular tailights and have been very happy with it. I'm not sure where you can find this product in the states. Call Peter White Cycles ( http://www.peterwhitecycles.com/ ) to see if you can order it.
The micro-switch doesn't have to cost $50. Just buy a brake lever designed for a scooter with the switch already in it. or buy a small microswitch at radioshack and put it in yourself. I bout a $10 brake lever that was a piece of junk but had a switch in it. I put the switch in my bikes lever and used a semi-truck brake light. Cars really notice even on a bright sunny day. I never ride without it on.
True, the switch doesn't need to cost $50. I just like to have switches that can handle the rain and sleet and gloom of night and occasional impact with Mother Earth. I ride in all weather conditions and I like to have bullet-proof mil-spec switches on my bike that will reliably survive adverse conditions.