light watt

light watt
   a unit measuring the relative power output of a light source. Calculating the power delivered in the form of visible light is rather complicated. For a monochromatic (single frequency) light source such as a laser, the power in light watts equals 683V(l), where l is the wavelength of the light and V(l) is the relative power in watts per lumen (W/lm) required to produce a constant brightness sensation in the eye at wavelength l. Values of V(l) are defined by the International Commission on Illumination (CIE). The maximum value of V(l) is 1/683 W/lm = 1.464 mW/lm at the wavelength l = 555 nanometers (nm), the wavelength to which the eye is most sensitive. When the source delivers light over a range of frequencies (as a light bulb does), it is necessary to compute 683 times the integral of V(l) multiplied by the fraction of energy delivered at wavelength l. See also candela and talbot.

Dictionary of units of measurement. 2015.

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