The Ushio 5000857 is a clear, short arc mercury lamp. These lamps are characterized by their tightly confined plasma discharge, high luminance, and ultra-stable arc. It operates at 50 watts. It features an enhanced electrode design for precise positioning and high arc stability. The Ushio 500857 50-watt bulb is designed for use in all 100W fluorescent microscope systems, lab equipment and UV applications.