It may also be a high intesity strobe bulb. By the way it flashes in videos that I have seen, the speed and intesity of the bulb leads me to think that.

You may actually have to check electronci stores as well, even Radio Shack. Both of you might want to contact Backyard Armor and some of the other tank groups as I am quite certain you two can't be the only two to run into this problem.