Back a few years ago my son did a science fair project to determine which color of light bulb would attract the fewest bugs. For several nights in a row he replaced the bulbs with varying color bulbs, and in the morning counted the bugs that were trapped on the bug strips just below them (not scientific enough for a Nobel prize but sufficient for a science fair project). He determined that the darker the light, the less bugs were attracted. I think the purple bulb we had attracted the fewest bugs, but it didn't give off enough light to really see by either, so the general conclusion was that the yellow light gave off the best light while attracting fewer bugs. If you went darker, it was too hard to see, and any lighter attracted more bugs.
