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Red Light And Circadian Cycle

Discussion in 'Light' started by j., Aug 11, 2013.

  1. j.

    j. Guest

    I read the interesting claim that red lights are used for night illumination because they are supposed to be safer in terms of interference on the circadian cycle.

    Is there any truth to that? What are some interesting implications?

    They give a bit more explanation:

     
  2. fyo

    fyo Member

    Joined:
    Jun 9, 2013
    Messages:
    106
    short wavelength light at around 460 nm is most effective in acutely suppressing human melatonin levels... People given dark, then 2 hours of light exposure, then darkness. "There was no significant difference in sleepiness between the 550-nm light exposure and the no-light condition"... We have obtained very similar results as Brainard et al. who reported approximately 60% suppression of melatonin after 2 h of light at 460 nm. http://jcem.endojournals.org/cgi/content/full/90/3/1311

    It is now well accepted that the circadian system is maximally sensitive to short-wavelength (blue) light and is quite insensitive to long-wavelength (red) light. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2744917

    goggles with selective exclusion of all wavelengths less than 530 nm... All subjects demonstrated preserved melatonin levels in filtered light similar to their dim-light secretion profile. Unfiltered bright light drastically suppressed melatonin production. http://jcem.endojournals.org/cgi/content/full/90/5/2755

    either blue-blocking (amber) or yellow-tinted (blocking ultraviolet only) safety glasses for 3 h prior to sleep... the amber lens group experienced significant improvement in sleep quality relative to the control group and positive affect. Mood also improved significantly relative to controls. http://www.ncbi.nlm.nih.gov/pubmed/20030543
     
  3. OP
    j.

    j. Guest

    Great info. It seems to make sense, but I wonder what Peat thinks of it.
     
  4. Peater

    Peater Member

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    Location:
    GB
    This forum could not have a worse colour scheme for browsing at night then :lol: (22:00 here in UK)
     
  5. charlie

    charlie The Law & Order Admin

    Joined:
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    Redshift or f.lux is helpful. :)
     
  6. Peater

    Peater Member

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    I use f.lux, but it doesn't turn blue to red (sadly)
     
  7. Mittir

    Mittir Member

    Joined:
    Feb 20, 2013
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    2,034
    Are you using "lighting at night" setting at Ember? That is 1200K
    color temperature. I feel sleepy within half an hour on this setting.
    I usually use 1900k setting.
     
  8. Peater

    Peater Member

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    Sorry I don't know what that is, a Google search just bought up some iPhone app results
     
  9. Mittir

    Mittir Member

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    2,034
    If you open f.lux, there is a bar next to "Done". If you click that bar you will see
    "Setting at night". Then choose Ember or other setting.
     
  10. jyb

    jyb Member

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    Ah, that's helpful. Stupid of me, didn't realize the default night settings is a full incandescent color!
     
  11. paper_clips43

    paper_clips43 Member

    Joined:
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    Messages:
    258
    Location:
    Sedona Arizona
    Thanks everyone for posting about F Lux, I just download it :)
    Can we just use dark room mode all the time? It seems to be much easier on my eyes.
     
  12. OP
    j.

    j. Guest

    For what it's worth, I'm more comfortable using a real physical filter combined with flux at 3000K, than reducing Flux to 2300K or less. I don't know how to measure it but I believe the physical filter combined with flux at 3000K has a lower color temperature (i.e., is more red) than flux alone at 2700K.
     
  13. Peater

    Peater Member

    Joined:
    Mar 26, 2014
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    Location:
    GB
    Done! Thanks
     
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