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Quantifying Amount of Blue Light Emitted by a Light Source

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#1 earlyriser

earlyriser

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Posted 14 August 2019 - 10:12 AM

One of the criticisms leveled at lighting codes that require lights be below a certain Correlated Color Temperature (CCT), e.g., 3,000K, is that CCT does not directly indicate how much blue light an LED emits. Enter the spectral G-index. This parameter provides a single number that characterized how much short-wavelength light is emitted by a source:

 

https://en.wikipedia...pectral_G-index

 

Seems like a reasonable figure of merit for nighttime lighting.

 

I think a weighted average based on the amount of scattering expected at each wavelength would provide a better indication of a light's effect on sky-glow, but the G-index seems like a step in the right direction.


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