27 watt four tube light bulb. Bi-pin base for use with 4-pin socket lamps. Please note: do not use with dimming devices. Energy efficient design. Rated at 27 watts, 6500K. Price is for one bulb. Four-tube bi-pin base bulb. For use with 4-pin socket lamps. Energy efficient design. Uses 27 watts. Light output comparable to a 100 watt incandescent bulb. 6500K color temperature.