Well, it’s still too cold to have bugs so I’m not ready to comment on the efficacy of that aspect, but it did fit over Feit Electric’s T8 “type B” LED bulbs that I got for the light in the garage. I have 4’, 2 bulb, ballast-free shop lights by Zone. I might order some more tubes so I can put more lights out there. This is way cheaper than buying actual yellow bug lights! Thanks!