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One of the newest lamp innovations is the LED (light emitting diode) lamp, also called a diode array bulb. LEDs are a unique approach to lighting. A diode is a special type of electronic device having two electrical terminals which allow current to run through it in only one direction. Diodes manufactured from certain materials can give off visible light. Thus, they’re called light-emitting diodes or LEDs. Gallium arsenide phosphide (GaAsP), for example, produces the red, green, or yellow light commonly seen in alarm clocks. In a diode array bulb, multiple LEDs are arranged within a single bulb.
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LED-array lamps with this design use approximately one watt to produce the same brightness as a typical 10W incandescent bulb. They’re also considered much more energy-efficient than even compact fluorescents. Amazingly, LED-array lamps may be rated to last 30,000-60,000 hours (10-20 years, used 8 hours a day).
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