CFL Reflector Flood design (R40) in 23 watt has soft white light (2700 Kelvin) & lasts about 10,000 hours, more than six times that of standard 1500-hour incandescent bulbs. It uses 75 percent less energy than its equivalent 90-watt incandescent. Ideal for use in recessed fixtures & open hanging fixtures, this bulb quickly pays for itself in lower electric bills, without sacrificing the soft glow associated with incandescent lamps. Bulb's medium base fits all standard sockets. Energy Star qualified.