High Pressure Sodium Lamp, 22, 614 K, 51000 LM Brightness (Lumens), 400 W, 198 V, Clear, Glass Material, 24000+ H Average Life, E39 Mogul Screw Base, S51 Ansi Ballast Code, Non Dimmable, 2.25 In Diameter, 9.75 In Length, 15.84 % Mercury Content, 0.42 LB