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As usual, clear your browser's cache. If you notice anything funny, leave a message and screenshot in the comments. ## To switch to the other modes >> click the sun icon in your user menu dropdown (top right)

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[–] 2 pts

Humans? The low pressure sodium "yellow tinge" street lights are meant for CCD "charge couple device" robot and cyber vision sensors in big cities and are harder for humans to see for the amount of photons emitted at that wavelength. Human "rods" in retina, have peak sensitivity at blue-ish moonlight.

Some tourist cities (San Francisco, etc) use more expensive fuller spectrum high pressure street lights, and do not care as much about autonomous car and truck technologies.

The politics of light frequencies used at night time are very charged. Crime cameras, astronomy, autonomous vehicle, human happiness, green flora enjoyment, flying insects, cost, electricity cost, bulb life, etc etc.

But it is ultimately a battle of HUMAN VISION vs digital CCD sensor vision.

[–] 0 pt

Damn, humans have it rough with those poorly designed ocular sensors of theirs.

[–] 1 pt

A CCD can work with a single photon of light.

Sadly, humans and all animals would be blinded if their eyes were that sensitive, so only technically work if TWO photons hit at almost the same time in the same place :

http://webhome.phy.duke.edu/~hsg/264L/images/photons-on-retina.html

Even then the retina filters out "noise" and looks for patterns in a multi layer neural net within the eye.

Fun Fact : People with their lenses surgically removed (cataracts), can see more spectrum of light.

Fun Fact 2 : Some females with vertical chimera of XX activating one X on one eye, and another X for the other eye, can have hypervision and see millions of more color shades of red than normal females. I cannot find a link, but it is true. Each X has to have the most divergent gene for red shade for each X. Humans have a variety of red chemical options, all close to true red.