The Utilitech E-39 BASE 300w # 0933409 CFL Replacement Daylight Bulb is a high-quality, energy-saving light bulb designed for indoor use. With a soft white finish and a long bulb life of 10,000-14,999 hours, this non-dimmable specialty bulb offers bright and consistent lighting. Made of glass and featuring a screw connector, this bulb is a reliable and efficient replacement for your existing lighting needs.