I put mine in the room/closet with the plant for 4 days, then I took it out and put it in another room in my house leading to my room. I figue this will help keep some away from the house/animals. Then when I switched the light I put a new one in the room again for 4 days or so, and then took that one out and it put it in a different room. I heard that when you switch to 12/12 they may come back because they were hiding (where I dont know:-)), but when I did this I never seen one agian. So did it work, for me yeah. I had them, I got a no pest strip, now they are gone and have not returned.