LED- Light Emitting Diodes
An LED lamp (LED light bulb) is a solid-state lamp that uses light-emitting diodes (LEDs) as the source of light.
3 types of LEDs:
- Conventional semiconductor light-emitting diodes
- Organic light-emitting diodes (OLED)
- Polymer light-emitting diodes (PLED)
LED Lamps are Interchangeable
LEDs Offer Higher Luminous Efficancy
Since the luminous efficacy (amount of visible light produced per unit of electrical power input) varies widely between LED and incandescent lamps, lamps are usefully marked with their lumen output to allow comparison with other types of lamps. LED lamps are sometimes marked to show the watt rating of an incandescent lamp with approximately the same lumen output, for consumer reference in purchasing a lamp that will provide a similar level of illumination.
Efficiency of LED devices continues to improve. LEDs do not emit light in all directions, and their directional characteristics affect the design of lamps. The efficiency of conversion from electric power to light is generally higher than with incandescent lamps. Since the light output of many types of light-emitting diodes is small compared to incandescent and compact fluorescent lamps, in most applications multiple diodes are assembled.
LED lamps offer long service life and high energy efficiency, but initial costs are higher than those of fluorescent and incandescent lamps.
More information on LEDs Available at http://en.wikipedia.org/wiki/LED_lamp