This Energy Miser FE-IIIB-150W-50K 150-watt compact fluorescent light bulb lasts up to 8,000 hours and saves over 70 percent in energy costs. One of the highest wattage self-ballasted lamps on the market today, it produces an amazing 8,200 lumens and 5000K full spectrum color temperature. Replacing a 500-watt incandescent, the FE-IIIB-150W/50K compact fluorescent's improved lamp design provides more lighting surface area in a compact space for cleaner more intense light output for museums, jewelry stores, and hospitals. Preferred in commercial applications. This CFL must not be used in a enclosed area such as recessed cans and non-air flow areas.