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The spectral G-Index is a variable that was developed to quantify the amount of short wavelength light in a visible light source. The smaller the G-index, the more blue, violet, or ultraviolet light a lamp emits.

Formula

The G-index is defined as follows:

G=-2.5\mathrm {log} _{10}{\frac {\sum \limits _{\lambda =380\mathrm {nm} }^{500\mathrm {nm} }E(\lambda )}{\sum \limits _{\lambda =380\mathrm {nm} }^{780\mathrm {nm} }E(\lambda )V(\lambda )}}

where

G is the spectral G-index
λ is the wavelength in nanometers.
E is the radiant flux of the lamp
V(λ) is the luminosity function;

Use

This optics-related article is a stub. You can help Wikipedia by expanding it.

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-The '''spectral G-Index''' is a variable that was developed to quantify the amount of [[blue]] [[light]] in a [[List_of_light_sources|visible light source]]. It is weighted relative to the sensitivity of [[luminosity function|human color vision]], so blue light counts more strongly than [[violet]] or [[ultraviolet]] light.
+The '''spectral G-Index''' is a variable that was developed to quantify the amount of short wavelength [[light]] in a [[List_of_light_sources|visible light source]]. The smaller the G-index, the more [[blue]], [[violet]], or [[ultraviolet]] light a lamp emits.
 ==Formula==
+The G-index is defined as follows:
-The spectral response function used to define the G-index is the product of a window filter from 380-500 [[nanometer|nm]] and the [[luminosity function]].
+:<math>
+G=-2.5\mathrm{log}_{10}
+\frac{\sum\limits _{\lambda=380 \mathrm{nm}} ^{500\mathrm{nm}} E(\lambda)}
+{\sum\limits _{\lambda=380 \mathrm{nm}} ^{780\mathrm{nm}} E(\lambda)V(\lambda)}
+</math>
+where
+* G is the spectral G-index
+* ''λ'' is the wavelength in nanometers.
+* ''E'' is the radiant flux of the lamp
+* ''V''(''λ'') is the [[luminosity function]];