Compact grow lights are available in several different watts. Popular grow light sizes for are 45 and 125 watts which makes it easy to find replacement grow lights.
Compact Fluorescent CFL 45W Perfect Daylight Grow Light Compact Fluorescent Plant Grow Lights 45W
Feliz 125 Watt CFL Grow Light 6500K
Compact Fluorescent grow light allow you to place them closer to the plant as less heat is generated. These grow lights have a full spectrum of color and could be used on more mature growing plants.