[Spridgets] Tesla--the electric Lotus Elise

[Glen Byrns]

The same type of chopper circuit is used to extend battery life in lighting 
circuits for mountain bikes, spelunkers, etc.
It uses the temperature sensitive resistance of the halogen filament to 
compute the length of the "ON" pulse so no power is wasted beyond the 
precise needs of the bulb.  I built one for my mountain bike light years ago 
and it worked extremely well.  The best part is that no power is wasted as 
heat as you would find with a bank of resistors, and the power sent to the 
bulb is just enough to keep it at optimal temperature for good output 
without excessive bulb temps.

Glen Byrns