This T100/4000/5K/LEDHDRP E26 (medium) base LED light bulb from Feit Electric provides maximum illumination for large rooms, yards, or anywhere you need more light. LED technology puts out an ultra-bright 4000 Lumens using just 35-Watt, which is up to 88% better than the equivalent to a 300-Watt incandescent. These bulbs have an average life of 25000 hours/22.8 years, are ROHS compliant, and are 100% Mercury-free. This LED light bulb has a working range of 120 volts - 277 volts. If you are replacing a high-pressure sodium bulb, you will need to bypass the ballast which is a quick and easy procedure.