Purely Products PUVLB555 55-Watt UV-C Germicidal Ultraviolet Replacement Bulb Non-Chemical approach to disinfection; Bulb is 25-millimeter wide, 36.35-Inch in length and fits the T5 Bi medium base At least 16,000 microwatt seconds per square centimeter but many units actually have a much higher dosage Commonly found in laboratories, hospitals and clinics to sterilize surgical equipment 8,000 hours or more of normal usage Prevents DNA of germs to reproduce