Spectrum and Color


Spectrum and Color

Color can be described as aresponse of the human brain at different wavelength of radiations. Here are the spectrums of colors at different wavelength of radiations:

  • Ultraviolet – 100 to 380nm
  • Purple – 380 to 436nm
  • Blue – 436 to 495nm
  • Green – 495 to 566nm
  • Yellow – 566 to 589nm
  • Orange – 589 to 627nm
  • Red – 627 to 780nm
  • Infrared – 780 to 10000nm

There were two types of receptors within the eye called “rods, and cones”. These receptors convert radiation within this range into signals to the brain. For this wavelength range the cone PR also translate light into color, dependent on light’s wavelength. When eyes see light made up exclusively of shorter wavelengths around 400 to 480nm, brain interprets it as “blue”, for others so on.  An increase from 100nm (UltraViolet) wavelength to 780nm (Red), the change at the spectrum can easily seen from our eyes with the order Purple, Blue, Green, Yellow, Orange and Red. The term “ Color ” might be used in two ways for describing light.  Although, colors have distinct spectrum for description, it does not mean anything alone.

There are other parameters to define light correctly which are brightness and surrounding apparent color. Due to the fact that, there are many methods to quantify color precisely such as “ Color Matching ”. Color Matching may also called as “ Colorimetry”. This method is based on the principle that light can be matched in appearance with the right combination of three idealized lights which are red, green, blue. As show in the Figure 5, blue and red combination give “  Magenta ” color, green and blue combination give “ Cyan ” color, green and red combination give “ Yellow ” color  and both of three combination give “ White ” color.  In order to quantify color, the spectrum or wavelength compound of light must be known.color


RGB color illumination

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