I like how you darkened the front, because it keeps your eyes from wandering out of the photo (that's probably a, "well duh!" for you, though).
It looks like a sodium vapor light to me. Mercury emits a whitish hue, where the sodium gives you that orangey tint that seems to be prevalent on the top and trunk of the car.
BTW, is that a 55 Bel Air? I'm not good with older cars, but it looks like a 55.