Tried one. It increased my mosquito bites and killed 1-2 per week. Needless to say I wasn't using it for very long.

Great against insects that are attracted by UV light, like mayflies, but not mosquitoes.

Some mayflies may look like mosquitoes, but they don't bite and are mostly harmless. It doesn't mean they are not annoying, especially when there are lots of them, and if that's a problem, UV light traps work great.

UV doesn't attract mosquitoes

Oh, are German mosquitoes different or is it really just placebo?

Thinking about it:

If I leave the window open with the light on in summer there will be hundreds of mosquitoes in the room (together with ~50% other critters). Even if no one was inside.

Window open without light: a dozen mosquitoes at max (as counted by suddenly switching the light on).

Whatever is known about other species is not correct about our breed.

Interesting thought. I wonder if its because of the swarm mind of mosquitoes "knows" that where there's artificial light, there are people. Or evolution has favored mosquitoes which get attracted to light at night.

That's not UV light

fair comment. the "UV" trap lights are not pure UV either though.