I just attempted to replace an outdoor light fixture on my porch. When I unscrewed it, a couple of spiders and gnats ran/flew away from under the light fixture.
I'm very new to home repair, so I have no idea whether or not I should be concerned about the fact that bugs could get in there. Bugs are going to be outdoors, of course, but there are places you don't want them, and I feel like a hole in your porch that leads God-knows-where is one of those places. I don't plan on replacing these fixtures again for a long time, so I'd like to do it right the first time.
Is there something I can/should do to prevent bugs from getting up underneath the fixture? Should I caulk around the base of the fixture, maybe? Or is it just an unavoidable thing that shouldn't bother me?
EDIT: As requested, here's a picture of the fixture in question.