HID Lamp, Universal Burning Position, MH250W/U STD, 250 W, 133 V, Metal Halide Lamp, Mogul E39 Lamp Base, ED28, 21000 lm Initial, 13700 lm Mean, 10000 hr Average Life, 65 CRI, 4200 K Color, Probe Start, Clear, 3-1/2 in Dia x 8-5/16 in L, 84 lm/W Efficacy, 5 in Light Center Length, 210 deg C Base, 400 deg C Lamp, Standards/Approvals: ANSI M58/E Specified