LittleBigM,
After much searching, a light bulb went off. We have 2 drills sitting around. Why not just buy 'nother battery, and hook up a headlight to that.

The one drill happens to come with a Craftman flashlight. 16.8V battery and a xenon bulb. Looks good and shines into the neighbor's yard (about 120')...problem is there's a strange black spot in the middle of the beam pattern. The light is nearly new. Do you think a MR16 would work without melting the lens cap????