Thanks Ole. I had seen that suggestion in an earlier post and it's definitely a creative one. I'd like to use an exposure timer, though, and was hoping that someone had figured out an incandescent solution. This site:

suggests that there is a solution. I don't begrudge anyone from profiting from their own ingenuity, but I'm already stressing the patience of my Treasury Department (i.e. wife) and $100 for two light bulbs is tough to get through a line item veto. Hopefully there is a more inexpensive solution that doesn't require me giving up on the timer. Thanks again.