Has anyone ever thought of trying to install a light sensor into their headlamp circuit? I was thinking that it may be possible to buy a cheap automatic light bulb socket, the kind people stick in a lamp post and splice it in so instead of turning on a light bulb it would pop up the headlamps. Any idea how easy/difficult this would be? Would such a device even work on the 12vdc in a car instead of its normal 120vac? Any thoughts would be appreciated.