this aint some creep cam is it? im at a five star hotel rn wtf

  • pixelscript@lemmy.ml
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    1 year ago

    Humans have best retina stimulation in blue light, not green light.

    The real reason I suspect the light happens to be green is that green phosphor is relatively inexpensive.

    Blue light could be disruptive to circadian rhythm while green light is somewhat less so, but I guarantee this was not part of the calculus here. It is just being thrifty. Circadian rhythm benefits are just a happy accident.

    • jet@hackertalks.com
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      1 year ago

      When fully light-adapted, the human eye features a wavelength response from around 400 to 700 nanometers, with a peak sensitivity at 555 nanometers (in the green region of the visible light spectrum). The dark-adapted eye responds to a lower range of wavelengths between 380 and 650 nanometers, with the peak occurring at 507 nanometers. source

      • dave@feddit.uk
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        1 year ago

        From that source:

        At threshold sensitivity, the human eye can detect the presence of about 100-150 photons of blue-green light (500 nanometers) entering the pupil.

        So I guess either blue or green leds are good for this application, and green much cheaper…

      • Tetsuo@jlai.lu
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        1 year ago

        I will just say that the recent video from Veritasium about night vision goggles does indeed say that you see better the blue light in the dark rather than the green.

        And that’s why high end military grade night vision goggles are in the blue spectrum.

    • Zoidberg@lemm.ee
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      1 year ago

      Wut? Blue? Are you sure about that? Afaik the peak is around 555nm, yellow green. Why do you think we have “high visibility yellow” vests and not “high visibility blue?”

      IIRC 555nm (or whereabouts) stimulates the L and M cones simultaneously.

      • dave@feddit.uk
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        1 year ago

        Light vs dark adapted. In bright light, the best wavelength is longer.