These UV Lamps are designed to provide a beam of 365nm wave with an average 7000uW/cm2 at 15" (38.2cm). Its powerful 100-watt light source fluoresces fine particles and hard to see surface defects. The lifetime of the light bulb is 2,000 hours. At 18" the lamp produces a highly intense center of UV irradiance about 5" in diameter. This offers the microscopist a quality tool in staining and polymerization other uses. The lamp head rotates a full 360, and is mounted into a removable pistol grip handle, which inserts firmly into the transformer base ( as a stand); it weighs only 2 1/2 lbs. It comes with a 5" (12.5cm) diameter black light filter which is recessed in the head. If more details are needed in order to study the subject, a second filter is available as an option that reduces the visible light. Total cord length is 15 ft.