*Effective sterilization -There are 2 types of ultraviolet lamps, ozone free series and ozone generating ones. -By emitting 253.7nm ultraviolet light, the lamp kills 99.99% microorganisms including bacteria, virus and fungi directly in 1 to 2 seconds. -While for the 185nm ultraviolet lamp, it react with oxygen gas to form ozone, then the ozone kills microorganisms by destroying their cells, as well as to decompose oil, remove fume and other peculiar odor.