Editing Color temperature (section)

===Aquaculture===

In [[fishkeeping]], color temperature has different functions and foci in the various branches.

* In freshwater aquaria, color temperature is generally of concern only for producing a more attractive display.{{citation needed|date=August 2012}} Lights tend to be designed to produce an attractive spectrum, sometimes with secondary attention paid to keeping the plants in the aquaria alive.
* In a saltwater/reef [[aquarium]], color temperature is an essential part of tank health.  Within about 400 to 3000 nanometers, light of shorter wavelength can [[Electromagnetic absorption by water#Visible light absorption in liquid water|penetrate deeper into water]] than longer wavelengths,<ref>{{cite web|url=http://www.lsbu.ac.uk/water/vibrat.html|title=Water Absorption Spectrum|last=Chaplin|first=Martin|access-date=2012-08-01|url-status=live|archive-url=https://web.archive.org/web/20120717061228/http://www.lsbu.ac.uk/water/vibrat.html|archive-date=2012-07-17}}</ref><ref>{{cite journal |author=Pope R. M., Fry E. S. |year=1997 |title=Absorption spectrum (380–700 nm) of pure water. II. Integrating cavity measurements |journal=Applied Optics |volume=36 |issue=33 |pages=8710–8723 |publisher=Optical Society of America |doi=10.1364/AO.36.008710 |bibcode=1997ApOpt..36.8710P |pmid=18264420 |s2cid=11061625 }}</ref><ref>{{cite book |author=Jerlov N. G. |title=Marine Optics. |series=Elsevie Oceanography Series. |volume=14 |pages=128–129 |year=1976 |publisher=Elsevier Scientific Publishing Company |isbn=0-444-41490-8 |location=Amsterdam |url=https://books.google.com/books?id=tzwgrtnW_lYC&pg=PA128 |access-date=August 1, 2012 |url-status=live |archive-url=https://web.archive.org/web/20171221064443/https://books.google.com/books?id=tzwgrtnW_lYC&lpg=PA128&pg=PA128 |archive-date=December 21, 2017 }}</ref> providing essential energy sources to the algae hosted in (and sustaining) coral. This is equivalent to an increase of color temperature with water depth in this spectral range. Because coral typically live in shallow water and receive intense, direct tropical sunlight, the focus was once on simulating this situation with 6500&nbsp;K lights.