I have a petzel headlamp, its an older incan lamp that runs on 4 cells with a screw base halogen bulb. I run it on nimh cells so the 6v bulb is a bit under driven. I am considering getting a 4.5v bulb like this but they are 8.00 plush shipping for one bulb. Does anyone know where I could find a 4.5 volt halogen bulb with a srew base cheaper?
