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Basic knowledge of LED energy-saving lamps

  • 2013-12-06
  • 32.32KB
  • Points it Requires : 1

        Light is an electromagnetic wave, and visible light is an electromagnetic wave with a wavelength of 400-700 nanometers. Electromagnetic waves smaller than 400 nanometers are ultraviolet rays, such as X-rays; electromagnetic waves larger than 700 nanometers are infrared rays, such as microwaves and broadcast radio waves. The unit of wavelength is nanometer, which is equivalent to one eleventh of a meter.

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