Fusion Metal Halide Clear BT37 Mogul base Pulse Start Lamps offer excellent light quality, candle power intensity and up to 50% longer life than traditional Metal Halide lamps. With faster warm-up times at temperatures as low as -40°C and 33% higher lumen maintenance than the Probe Start version, Pulse Start Metal Halide lamps make a more cost effective solution in some applications. In addition, the high system lumens of these lamps result in excellent illuminance to the working surface which makes them wellsuited for mounting heights above 10 feet.