The C10000/5K/LEDG3/HDRP corn cob-shaped LED light bulb from Feit Electric provides maximum illumination for large rooms, backyards, barns, parking lots, or anywhere you need more light. Each bulb comes with an E26 (medium) base and an included E39 (mogul) base adapter to easily upgrade HID non-ballast fixtures to LED. Energy-efficient LED technology puts out an ultrabright 10,000 lumens using just 80 watts of electricity - up to 84% less energy than equivalent 500-watt incandescent bulbs. These bulbs have an average life of 35,000 hours/32 years, are ROHS compliant, and are 100% Mercury-free. They have a working range of 120 - 277 volts. These bulbs replace 100w & 250w High-Pressure Sodium, Mercury Vapor, and Metal Halide HID light bulbs. LED lights don't need a ballast and can be used in any socket. If you are replacing a high-pressure sodium, Mercury Vapor or, Metal Halide bulb, you will need to bypass the ballast in a quick and easy procedure. Then you can enjoy the energy savings, instant on, and brightness that LEDs provide.