Sunlite 03637-su mh50/u/med/ps 50 watt metal halide light bulb, medium base sunlite high intensity discharge lamps are perfect for outdoor lighting and commercial interiors. These energy efficient hid lamps offer exceptional efficacy, great color rendition, have a long service life and excellent lumen maintenance. This sunlite 50 watt metal halide medium based ed17 bulb offers a light output of 3400 lumens and has an average rated life of 10,000 hours. Make sure to choose the correct lamp type for your fixtures, check the ansi codes to help determine the best match for the type of fixture and the ballast it uses. Also check if your fixture requires lamps that are pulse start and/or protected. features: package quantity: 12 average life hours: 10000 wattage: 50 shape: ed17 lumans: 3400