This amazing sterilizer will kill mould spores on contact as well as mites etc.. Just use once a fortnight on your intake fan area and on the pots, floor etc... Anywhere the little buggers hide and breed. If you have a mite infestation if all else fails run the room with no plants for 2 weeks spraying house clean every three days. This will eliminate them for sure as a last resort. The lights just have to be on for say twelve hours so they can move through there life cycles and die off.