The Ushio 5001329 is a clear, short arc mercury lamp. It operates at 100 watts and 16/24 volts and has an average life rating of 300 hours. It features an enhanced electrode design for precise positioning and high arc stability. This bulb has an initial lumen output of 3000. This bulb measures at 3.54 inches in length and is designed for use in all 100W fluorescent microscope systems.