Ultraviolet light. For research, laboratory, forensic and other applications requiring a strong UV light. The overall size of this UV light fixture is 19″ x 4″ x 1.5″. It has a built in 110 Volt, 15 Watt transformer and accepts 18″ long F15T8 fluorescent UV lamps with G13 base. Wavelength=350 nanometer (preheated).