Metal Halide Lamp, 65, 4000 K, 11700 LM (Horizontal);13600 LM (Vertical) Brightness (Lumens), 175 W, Clear, Hard Glass Material, 6000 H (Horizontal);10000 H (Vertical) Average Life, Mogul Base, M57 Ansi Ballast Code, Non Dimmable, 3.5 In Diameter, 8.25 In Height, 25.74 % Mercury Content, 5.24 LB