Initially after getting this set up in the back yard, I was only seeing dead moths clinging to it, so I was wondering if it was attracting mosquitoes.  Ground cover was present under where the lamp was located and I decided to lay an old piece of bubble wrap on top of it to see if any dead mosquitos accumulated. Sure enough, in the morning, there was a small pile of them.  I now see some on the lamp itself. So, my experience indicates it really does work.