Another thing to check for on the light is to make sure that the screws/bolts holding it to the robot are insulated from the metal on the light. We had this problem last year, and our whole robot frame was grounded. We didn't realize it till a judge at nationals caught the problem and told us to fix it. So, that probably won't cause the problem you're having, but be careful about it anyway.
Oh, we don't have our light either
Stephen