Incandescent light bulbs, which convert heat into light, use only about 2% of the electricity they consume and wasting the rest as heat.
Lighting accounts for nearly one quarter of the world's electricity use, the potential energy savings are prodigious.
The most powerful light-emitting diodes (LEDs), which are not expected to enter commercial production until 2010, use only a fraction of the electricity used by incandescent bulbs and often outperform compact fluorescent bulbs in terms of energy efficiency.
The U.S. plans to ban the bulbs beginning in 2012.
Here are some more Bright Ideas For Lighting
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