H-Shaped germicidal lamps emit light spectrum at 254nm, which causes the DNA damage and bacterial death or change. These lamps can kill a variety of microorganisms, including viruses, bacteria (Bacillus, Mycobacterium), fungi, rickettsia, etc.. These lamps can apply in the microbial contaminated surface, water and air. The lamps are also used for a variety of different sterilization, air and water purifiers and so on.