OK, this is just plain strange. We live in a 120 year old house in Colorado. Over the past couple of months we have been getting water building up on the inside of the lens of a fluorescent light ceiling fixture in our basement. We have looked everywhere for a leak and have found nothing. Also, we have found no moisture build up on anything around this light including on the light itself. We are thinking that this must be a condensation build up of some kind but we really don't understand how that could be. We have only been in the house for 2 years but this did not happen last winter when we had the same temp/moisture conditions in the basement that we have now. And it didn't happen at all during any other season. Any ideas? Thank you!