Melanopic Green The Other Side of Blue

By Ian Ashdown, P. Eng. (Ret.), FIES
Senior Scientist, SunTracker Technologies Ltd.

Numerous medical studies have shown that exposure to blue light at night suppresses the production of melatonin by the pineal gland in our brains and so disrupts our circadian rhythms. As a result, we may have difficulty sleeping. It is therefore only common sense that we should specify warm white (3000 K) light sources wherever possible, especially for street lighting.

True or false?

Table T-8: Tentative Bactericidal Efficiency of Ultraviolet Radiation

[T-8] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.8.

Table T-9: CIE 1988 Modified Two-Degree Spectral Lumnous Efficiency Function for Photopic Vision

[T-9] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.9. Note: Information in this table was obtained from Appendix of CIE 86 (1990), CIE 1988 2º Spectral Luminous Efficiency Function for Photopic Vision. Note: This function is identical to V(λ) at wavelengths of 460 nm and longer.

Table T-5A: Color-Matching Functions and Chromaticity Coordinates of CIE 1931 Standard Colorimetric Observer

[T-5A] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.5A. Note: Information in this table was obtained from Table 1 of ISO/CIE 10527-1991, Colorimetric Observers.

Table T-5B: Color-Matching Functions and Chromaticity Coordinates of CIE 1964 Supplementary Standard Colorimetric Observer

[T-5B] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.5B. Note: Information in this table was obtained from Table 2 of ISO/CIE 10527-1991, Colorimetric Observers.

Table T-6: Relative Spectral Power Distribution of CIE Illuminant “C”

[T-6] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.6. Note: Information in this table was derived from Table 1.1 of CIE 15.2: 2004, Colorimetry, 3rd ed.

Table T-7: Scotopic Spectral Luminous Efficiency Values, V′(λ) (Unity at Wavelength of Maximum Luminous Efficacy)

[T-7] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.7.

Table T-1: Luminance Conversion Factors

[T-1] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.1.

Table T-2: Standard Units, Symbols, and Defining Equations for Fundamental Photometric and Radiometric Quantities*

[T-2] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.2.

Table T-3: Illuminance Conversion Factors

[T-3] NOTE: This table’s section number was changed in RP-16-17 Addendum 1. The previous section number was 13.3.

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