Zetamar — 2009

light emitting diode (LED)

 

Light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness... read more

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photometry   |||

 

Optics Photometry is the science of measurement of light perceived brightness to the human eye. In optic photometry the radiant power in different wavelength is weighted by luminocity (visiual sensitivity) function based on human eye brightness sensitivity...  read more