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Light-emitting diodes (LEDs) differ from other light sources, such as incandescent and fluorescent lamps, in the way they generate white light.
Incandescent, fluorescent, and high-intensity discharge (HID) lamps radiate across the visible spectrum, but with varying intensity in the different wavelengths. Unlike incandescent, fluorescent and HID sources, LEDs are near-monochromatic light sources.
These original EMS pages will be available until May 31, 2011 at which point you'll automatically be redirected to the new pages. When white light shines through a prism, the white light is broken apart into the colors of the visible light spectrum.
The spectral power distribution (SPD) for a given light source shows the relative radiant power emitted by the light source at each wavelength.


These sources have 'spikes' of relatively higher intensity at certain wavelengths, but still appear white to our eyes. Incandescent sources have a continuous SPD, but relative power is low in the blue and green regions. What appears to our eyes as 'white' is actually a mix of different wavelengths in the visible portion of the electromagnetic spectrum. In traffic lights, for example, LEDs have largely replaced the old incandescent + colored filter systems. The diagram below illustrates visible light as one small portion of the overall electromagnetic spectrum.
Using colored filters or lenses is actually a very inefficient way to achieve colored light.


Electromagnetic radiation in wavelengths from about 380 to 770 nanometers is visible to the human eye. For example, a red filter on an incandescent lamp can block 90 percent of the visible light from the lamp. Red LEDs provide the same amount of light for about one-tenth the power (12 watts compared to 120+ watts) and last many times longer.



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