Shat-R-Shield Sylvania HID-Metal Halide Lamp, Shatter-Resistant, MP175 BU (PK X 6), 175 W, 132 V AC, HID Lamp, EX39 Lamp Base, BT28, 10200 Lumens, 10000 hr Average Life, 65 CRI, 4000 K Color, Clear/PFA Coated Lamp, Pulse Start, M57/O Ballast, Open/Base-Up Fixture, 3.504 in Dia x 8.31 in L