Designed to fit E39 sockets, 43 Watt Model LEDSB-BT56-E39 delivers 4,200 lumens of pure white light with operating temperature range of -20 to 85°C and operational life of 50,000 hours. Solid state design makes lamp resistant to impacts and vibrations. Featuring same base and width as standard BT56 light bulbs, Model LEDSB-BT56-E39 offers suitable replacement for flood lights, high bay fixtures, and low bay fixtures in industrial and commercial applications.