... is a question noticeable, in our country all the mercury lamps transmit 185nm short wave ultraviolet rays, which result in ozone ... 7nm and transmissivity cut at short wave UV220nm. The sterilizing lamps made of this tubes have a strong sterilizing ability and ... environmental protection products for the people.The UV sterilizing lamps (include ozone-free lamps) produced in our company are widely used in ...