Have not seen critters, but webs seem to keep growing. Does not affect light projection, just knowing that they are there is a bother. I know that spiders prey on flying insects, and I have had a few major bug splattered rides that I have lagged on cleaning off the bug guts, maybe these guys are waiting for their next meal. Just a thought. Regardless the housings have to come off, and I have to find something to sweep the webs out.