Pulsed Intense-Light Ultraviolet Sterilization Lamp
Ultraviolet/UV germicidal lamps include mercury, LED, xenon and electrodeless types. UV disrupts microbial DNA/RNA to kill cells or progeny, serving air, water and surfaces. Pathogens thrive in dark, damp, crowded, poorly ventilated places, so lamps are used in homes, public and medical settings. Testing standards, quality requirements and evaluation are covered. Germicidal lamps emit280nm-100nm; 253.7nm is most germicidal for water, air and clothing. Low-pressure mercury lamps at 15W, 20W, 30W and 40W are compared with summer sunlight; low power slow sterilization and cause bacterial antibodies. At220V they are mainly for personnel disinfection in changing, veterinary and laboratory rooms. About5min irradiation kills clothing-borne bacteria/viruses; about 30min disinfects laboratory/operating-room air. Mercury lamps include high, medium and low pressure; low pressure predominates in disinfection owing to mercury's environmental harm. National-standard average life is8000hours; some reach13000. Alternatives include UVLED(20000hours average), xenon(100000flashes) and electrodeless(theoretically unlimited life), with higher power/faster disinfection but higher cost, for large-space air, water treatment and food processing.
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