Philips 13162-3 - 1500 Watt - BT56 - Metal Halide - Unprotected Arc Tube - 3700K - ANSI M48/E - Universal Burn - MH1500/U,Philips,046677131623" /> BT-56 bulb with a Mogul (E39) base Gives a neutral white light Estimated life of 2.8 years based on 3 hours use per day