3701800 100 Watt ED17 HID Metal Halide Clear with Medium Base Clear finish, metal halide, medium base, 100 watts, ANSI M90E Bulb life of 10,000 average rated hours, light appearance 4200K "E"-rated - for use in fixtures designed for enclosed rated HID bulbs only, for probe start or pulse start ballasts Suitable for indoor use, and outdoor applications when used in an outdoor rated fixture For use in commercial and industrial applications where color rendering is important