A lit filament bulb in the dark - does a lamp at the entrance hole keep owls and bats out? - MDK Swiftlet
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Will a light at the entrance hole keep owls out? My answer from five years ago, and why I’m crossing it out

Plenty of owners put a bright light at the entrance hole to keep owls and bats away. It works for a few days. A week later they’re back in. And a light that bright is blocking your own birds.