Editing Luminous efficiency function (section)

== Other functions ==

=== Non-vision parameters ===

The wavelength-dependent effect of light is seen not only with vision, but also (in humans) in the [[circadian rhythm]] via [[melanopsin]]. For reporting the effect of light on the human circadian rhythm, a value called ''melanopic illuminance'' is used, defined using a luminous efficiency function specific to the melanopsin. The unit is lux (lx) used in a non-SI-compliant fashion. With CIE S 026:2018, the system has become SI-compliant, with the melanopic equivalent daylight illuminance (M-EDI, unit [[lux|lx]]) being derived from melanopic irradiance (unit W/m<sup>2</sup>). A human being subject to 100 lx of M-EDI of light should have the same alternation to their circadian rhythm as if they are being exposed to 100 lx of daylight.<ref name="LucasGroup">{{cite web |title=Measuring melanopic illuminance and melanopic irradiance |url=https://lucasgroup.lab.manchester.ac.uk/measuringmelanopicilluminance/ |website=Lucas Group}}</ref>

Lucas (2014) and the later CIE S 026 also define luminous efficiency function specific to four other human opsins. Lucas uses non-SI-compliant lux while CIE uses SI-compliant EDI lux.<ref name="LucasGroup"/> Although the CIE standard requires payment, the associated toolbox and its user guide is available for free.<ref>{{cite web |url=https://files.cie.co.at/CIE%20S%20026%20alpha-opic%20Toolbox%20User%20Guide.pdf |doi=10.25039/S026.2018.UG |quote=This User Guide relates to the &alpha;-opic Toolbox v1.049a, published by CIE Division 6. The Toolbox (DOI 10.25039/S026.2018.TB) and User Guide (DOI 10.25039/S026.2018.UG) are maintained under CIE Division Reportership (DR) 6-45.|title=User Guide to the &alpha;-opic Toolbox for implementing CIE S 026|date=2020 |last1=Cie }}</ref>

=== Non-human animals ===

Most non-[[primate]] [[mammals]] have the a similar luminous efficiency function to people with protanopia.  Their insensitivity to long-wavelength red light makes it possible to use such illumination while studying the nocturnal life of animals.<ref>{{cite journal|author1=I. S. McLennan|author2=J. Taylor-Jeffs|name-list-style=amp|title=The use of sodium lamps to brightly illuminate mouse houses during their dark phases|journal=Laboratory Animals|year=2004|volume=38|issue=4|pages=384–392|pmid=15479553|doi=10.1258/0023677041958927|s2cid=710605|url=http://la.rsmjournals.com/content/38/4/384.full.pdf}}{{Dead link|date=March 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

Definition of ''melanopic illuminance'' and opsin-specific illuminances in the sense of Lucas (2014) are available for rodents. There is a significant difference at short wavelengths (&lt;&nbsp;420&nbsp;nm) because the rodent eye filters light differently before the retina compared to the human eye.<ref name="LucasGroup"/> A 2024 article by Lucas's Group and international researchers calls for better standardization of light levels used in animal experiments using these species-adjusted illuminance measurements, both to improve the reproducibility of light-related experiments and to improve animal welfare. The article includes &alpha;opic data for mice, brown rats, macaques, cats, and dogs. It links to two separate toolboxes, one for calculating the species-specific EDI from a [[spectral power distribution]], the other for estimating the species-specific EDI for a given amount of photonic lux and a light source of known spectrum.<ref>{{cite journal |last1=Lucas |first1=Robert J. |last2=Allen |first2=Annette E. |last3=Brainard |first3=George C. |last4=Brown |first4=Timothy M. |last5=Dauchy |first5=Robert T. |last6=Didikoglu |first6=Altug |last7=Do |first7=Michael Tri H. |last8=Gaskill |first8=Brianna N. |last9=Hattar |first9=Samer |last10=Hawkins |first10=Penny |last11=Hut |first11=Roelof A. |last12=McDowell |first12=Richard J. |last13=Nelson |first13=Randy J. |last14=Prins |first14=Jan-Bas |last15=Schmidt |first15=Tiffany M. |last16=Takahashi |first16=Joseph S. |last17=Verma |first17=Vandana |last18=Voikar |first18=Vootele |last19=Wells |first19=Sara |last20=Peirson |first20=Stuart N. |title=Recommendations for measuring and standardizing light for laboratory mammals to improve welfare and reproducibility in animal research |journal=PLOS Biology |date=12 March 2024 |volume=22 |issue=3 |pages=e3002535 |doi=10.1371/journal.pbio.3002535|doi-access=free |pmid=38470868 |pmc=10931507 }}</ref>

The wavelength-dependent attractive effect on bees and moths have been quantified with a relative arbitrary unit of "attraction". These data have been used to design [[white LED]] light sources with lower arthopod attraction at night.<ref>{{cite journal |last1=Longcore |first1=Travis |last2=Aldern |first2=Hannah L. |last3=Eggers |first3=John F. |last4=Flores |first4=Steve |last5=Franco |first5=Lesly |last6=Hirshfield-Yamanishi |first6=Eric |last7=Petrinec |first7=Laina N. |last8=Yan |first8=Wilson A. |last9=Barroso |first9=André M. |title=Tuning the white light spectrum of light emitting diode lamps to reduce attraction of nocturnal arthropods |journal=Philosophical Transactions of the Royal Society B: Biological Sciences |date=5 May 2015 |volume=370 |issue=1667 |pages=20140125 |doi=10.1098/rstb.2014.0125|pmid=25780237 |pmc=4375365 }}</ref>