Green Technology

Fun Facts from the EPA ...
 

A typical light bulb wastes what percent of electricity?

a. 5 percent
b. 30 percent
c. 65 percent
d. 90 percent

The answer is d.

The typical incandescent light bulb turns only about 10 percent of its electricity into light. A typical light bulb, when on, is hot. That's because 90 percent of the energy is wasted as heat, which means it isn't very energy-efficient. ENERGY STAR-qualified lighting, such as compact fluorescent bulbs, uses two-thirds less energy and generates 70 percent less heat than an equivalent incandescent light bulb.

More on Energy Efficient Lighting  Link 

Via   EPA