Cheers mick, So the bulb is still replaceable within the projector (so say if I had a 35w globe I could change it to a 55w if I wanted too) and when you turn on the low beam the globe turns on and your high beam switch just supplies the solenoid which then opens the projector up a bit more and let's all the light out and that's how you get such a precise cut off? Just trying to wrap my head around all this, I like knowing how stuff works.
Cheers,
Irvs