Series ZWS ultraviolet germicidal lamps are straight-tube low-pressure mercury discharge lamps that radiate short-wave ultraviolet rays of chiefly 253, 7nm with strong effect. Having particularly strong action on nucleoalbumin, these rays can cause variation work. They are applied in germ research, food-stuff and pharmaceutical industries. Besides, they can be used also in various sterilizers, air purifiers and cosmetic facilities. (It is inadvisable to use them in a cold storeroom.)