On 2020-10-16 17:35:+0100, David Woolley wrote: >Red is used because the rod cells, that are used for night vision, down to a point where they are almost quantum limited <https://www.cns.nyu.edu/csh/csh04/Articles/Rieke1998.pdf> > >See <https://midimagic.sgc-hosting.com/huvision.htm> Thanks for posting these links.