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Sun Colour Temperature

Discussion in 'Ask Jack' started by Sajid Mahmood, Aug 18, 2018.

  1. Sajid Mahmood

    Sajid Mahmood Administrator

    Hi Dr Jack Kruse,

    The Colour temperature of sunrise is 1600 K - 1800 K, solar noon is 5500 K - 5700 K and sunsets are 16,000 K.

    Sunsets have a much higher colour temperature than sunrise and solar noon, does that mean Sunsets are more stronger in blue wavelengths when compared to sunrise and solar noon?

    Thank You
     
    Last edited: Aug 18, 2018
    Brent Patrick and John Nicholas like this.
  2. Jack Kruse

    Jack Kruse Administrator

    yes. ThAT IS the target of the melanopsin receptor 435-465nm dominates the last hour of sun in a day and this is a crescendo stimulus and then it falls immediately to zero K and when that happens the clock of melatonin release in pineal begins.
     
  3. Forest

    Forest Gold

    Is there a chart that shows all this K at times of the day with the colors distributions that show up at different times.

    Also when are the best times to do blue lit work if necessary
     
  4. Jack Kruse

    Jack Kruse Administrator

    Yes. In the patreon blogs and some blogs on posts.
     
  5. Forest

    Forest Gold

    Which one has the amount of each color someone?
     
  6. drezy

    drezy New Member

    "amount of each color" is a simplification that could be a little dangerous if applied incorrectly.

    If you want to try that trick your location will matter. Look at the materials in the blogs and note roughly when blue maxes out.
     
  7. drezy

    drezy New Member

    If you want to calculate it though this is a place to start with some math:

    https://en.wikipedia.org/wiki/Planckian_locus

    You'd just be calculating backwards from chromaticity.

    Even if you don't like math it's still pretty to look at.

    [​IMG]
     
    Sajid Mahmood likes this.
  8. drezy

    drezy New Member

    Also: Note that even all that only accounts for the visible light spectrum not daily changes in UV or not IR.
     
  9. DLO

    DLO StarFish

    Anyone got a link to that image jacks posted in the time of day in relation to the color temp?
     
  10. drezy

    drezy New Member

  11. Sajid Mahmood

    Sajid Mahmood Administrator

    If i’m not mistaken, I'm quite sure that chart illustraites that the colour temperature of the sun is highest at solar noon. Which would obviously be incorrect.
     
    Last edited: Aug 23, 2018
  12. drezy

    drezy New Member

    Sajid Mahmood likes this.
  13. drezy

    drezy New Member

    Sajid, it's like midnight in the UK now. I just called Lady Crawley and she's coming to vent disdain at you until you get to sleep:
    [​IMG]
     
    Last edited: Aug 22, 2018
    Sajid Mahmood likes this.
  14. Sajid Mahmood

    Sajid Mahmood Administrator

    Last edited: Aug 23, 2018
  15. drezy

    drezy New Member

    Sajid Mahmood likes this.
  16. Sajid Mahmood

    Sajid Mahmood Administrator

  17. drezy

    drezy New Member

    You'd be just fine. I just really dig the science and the way human monkeys (me included for sure) use it selectively.

    Check this out. I could make a youtube product pitch where I slap a lab coat on, package the above information, show a little of the linear algebra (to show my math chops), and convince you that my LED array with the most reduced flicker on the market tracks your specific location's sunny day color temperature better than any other existing product.

    That all sounds good, right?

    Aside from the fact that all this would be based on imperfect models, you could really torpedo me with what's written Reality 12 and certainly with the ebigger implications of what's implied there:

    https://jackkruse.com/reality-12-dopamine-blinds-us-from-natures-fractal-fabric/


    The amount being said there is big. The amount possibly being implied there is enormous.

    Look at this:

    spectral_sun.jpg
    Look at this:
    [​IMG]

    And look at this:
    [​IMG]

    What's the gene without the sequence and what the music without the interval? At best any man made light could only approach music without the interval and I could say "What's wrong, all the notes were played..."
     
    Sajid Mahmood likes this.
  18. Sajid Mahmood

    Sajid Mahmood Administrator

    Once the sun has set, how long does it approximately take for the colour temperature to drop down to Zero K? Instantly, approximately 30 mins, 45 mins, or hour
     
    Last edited: Aug 25, 2018
  19. Sue-UK

    Sue-UK New Member

    I am wondering if it relates to the solar elevations at civil, nautical and astronomical twilights. Peaking at the end of nautical, - 12? :confused:

    upload_2018-8-28_10-45-8.png

    How quickly it moves from sunset to darkness probably varies by latitude and season, but from https://www.timeanddate.com/astronomy/uk/london, today in London sunset is at 19.55 and the end of nautical twilight is 21.14.
     
    drezy and Sajid Mahmood like this.
  20. Sajid Mahmood

    Sajid Mahmood Administrator

    Thanks @Sue for the input! You’re absolutely correct. I totally agree, It definitely varies according to longitude, Latitude and season
     
    Last edited: Aug 28, 2018

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