Agrobrite FLC26D 26-Watt Spiral Compact Fluorescent Grow Light Bulb (130W equivalent CFL), 6400K 26-watt/6400k bulb is equivalent to a 130-watt incandescent bulb Compact fluorescentspiral bulbs reduce energy costs UL Listed Fits any standard light fixture with Medium Base Produces 1600 lumens and will last an average of 10,000 hours