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Hit them they light up....
3 Volt red LED and 2 x 1.5 v button cells.

Step 1: Battery Bit

Picture of Battery Bit
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Drill a 1/4 inch hole 1/4 deep and a small10th inch downward hole into the 1/4 inch hole.
Use a 1 1/2" x 3/4" baton, about 1 foot long.
Push one leg of the LED down the small hole.
Push the batteries into the 1/4 hole, and suspend the other leg over the front of the batteries.
 
Great idea, I made a few targets using my hole saw a few days ago but was thinking of what to do with them. This Instructable undoubtably deserves more views than it is! Will try to get round to doing this sometime! Thanks for sharing!