This self-ballasted, fluorescent spiral bulb uses a smaller, T2-size bulb that's designed to fit in most lamps. Using just 23 watts, this spiral bulb produces a warm white light at 2,700 Kelvin. Nondimmable spiral bulb features a medium base & produces 1,600 lumens for 12,000 hours. 120-volt spiral bulb is perfect for lighting areas where harsh, white light is not desired. Bulb is Energy Star qualified & RoHS compliant.