these oudor control cfl defenetly work i have a freind who uses them after he used them in the toilets in his bar to illeminate the urinal oudor .he then started using them in his grow room and when they are on the smell is non existant. but you need around 4 in a grow room 8ft by 8ft . that is the size of his room and he tryed 1 with no sucsess and added until the odour was no more.the postman.