If you've tried starting seeds before and been disappointed because the plants looked tall and leggy, most likely there wasn't enough light for your seedlings. Supplementing the natural light in your home doesn’t have to be complicated. Here are some of the different grow light options available to you. Incandescent bulbs usually come in low wattage (60-90) and tend to emit more heat than light. They will cover an area of approximately 2 feet, just about one standard seed starting tray. A 23 Watt CFL is equal to a 100 watt incandescent bulb. A 55 watt CFL is equivalent to 230 watt incandescent. These CFLs are full spectrum bulbs. This means they produce light similar to natural daylight. A 2' fixture will cover one standard seed starting tray.