But I think some mosquitoes are quite "clever" that they would not be attracted by the light. I used to have one before. It just worked for a short term.
I agree that 金剛牌驅蚊器 is useless. Now I use 窗紗 to block them flying from the bedroom's windows; Konki spray in the living room and 拜高藥片 near the bedroom's entrance. It is true that using too much chemicals is not good. The most important thing is to keep good ventilation.