The Ushio MHL-121HT is an MHL series metal halide UV lamp component for qualified professional equipment. Ordering code 5000071 is rated at 3000W with a 400-450nm spectral range for Diazo applications. It features a Metal 14.3 mm base, Metal contact, lead wire length not provided, 25mm diameter, 181mm MOL and 86mm LL. For use only in appropriate UV protective housings and compatible ballast systems.