Big Time Huge! - The second coming of the light bulb part deux.
The Verge reports that Cree has announced a $13 LED that resembles an incandescent light bulb in the quality of the light. If this is true, this a huge advancement. For those that are not familiar with LED light technology, it is a semiconductor like a chip, and it's life is effectively forever. When you buy a house you basically get the light forever now.
To give you a sense of how inexpensive LEDs are, the San Fransisco Bay Bridge (not Golden Gate) is now lit up as a public art project for less than $30 a day.