Several years ago, the local nature center had bulbs in their light fixtures that attracted a large variety of insects to the area. But only on nights when the moon either was not present, or was, at most, half full when observed. On waxing/waning gibbous to full moon nights, though, the number and variety of insects in the area was significantly lower. So much lower that I just stopped visiting the place during bright moonlit nights and focused my attention on moonless to half moon nights for greater success.
Do other light trappers have similar experiences?
Btw, the lights have since been replaced with bulbs that clearly put off far less UV light, so the place is all but a complete dead zone for attracting insects nowadays, but I still make nightly excursions from time to time.