LEDs are close to becoming metaefficient alternatives to regular light bulbs, but they are not quite there. Right now the brightest LED bulb is equivalent to a 25W incandescent bulb.
The bulb seen here has 36 LEDs and runs on 1W. That means it could run 10 hours a day for a whole year for less than two dollars. It will also last for at least 10 years. The drawback is the price: $18.95 each. The expense can be justified if they are used outdoors, in boats, or in off-grid homes.
Available from: Super Bright LEDS