Light

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Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm, or perhaps 380–750 nm). In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.
Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm, or perhaps 380–750 nm). In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm, or perhaps 380–750 nm). In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Five primary properties of light are intensity, frequency or wavelength, polarization, phase and orbital angular momentum.

Light, which exists in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.

QUANTITY RADIOMETRIC PHOTOMETRIC
power watt (W) lumen (lm)
power per unit area W/m2 lm/m2 = lux (lx)
power per unit solid angle W/sr lm/sr = candela (cd)
power per area per solid angle W/m2-sr lm/m2-sr = cd/m2 = nit

[edit] Also see

[edit] Reference

  • Wikipedia Over-illumination [1]
  • Venture Lighting International, Inc Lighting Basics [2]

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