I am in a rural area with many flies and mosquitoes. I bought it for an office that definitely does not exceed 20 square meters. I left it open all day and all night and it managed to catch a moth. During the day, it doesn't do any work at all. I bought it as a trial to use in other spaces, but I definitely won't buy another one. The bulb it has seems powerful, but it doesn't do the job. Currently, I have it plugged in 40 points away from me, and all the flies are on my desk.