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