It's incandescent, so it'll probably burn your plants. You're much better off with a compact fluorescent bulb, or several of them, or some form of HID lighting.

A short summary of efficiency:
Incandescent lights: 10% light, 90% heat
Fluorescent lights: 40% light, 60% heat
HID lights: 50% light, 50% heat.

These are only approximations, and vary based on the light. Also, the percentage of each light's spectrum that is usable by plants varies depending on the type of light.