Not sure there is enough depth behind the grill to fit a light. If one does, it would have to be a very flat light which would probably cause it to be a flood/proximity light. I'm sure that's not what you want and would prefer more of a spot light with more throw.
I thought about cutting out the section behind where the front plate mounts with a Dremel and mounting a 31" bar in there. The laws aren't strict about having front plates here. Has anyone done this yet?