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[SOL] Various Links to Solar Info

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#1 Andrea B.

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Posted 25 April 2015 - 16:26

Various Links to Solar Info



The Lowdown on Blue Light: Good vs. Bad
http://www.reviewofo...essonid/109744/
The average proportion of blue light that's found in sunlight during the day is between 25% to 30%. Even on a cloudy day, up to 80% of the sun's UV rays can pass through the clouds.

The specific band of blue light most harmful to the retina and to the RPE cells was identified to be at 415 nm to 455 nm. BAD whether from the sun, LED lighting, or CFLs.

The labeled blue-turquoise light range, which is from 465 nm to 495 nm, is GOOD, essential to our vision, the function of our pupillary reflex, and in general to human health.



PDF: Human color vision and the unsaturated blue color of the daytime sky
Glenn S. Smith, American Journal of Physics, Volume 73, Issue 7, pp. 590-597 (2005).
Sky Blue: The color perceived is similar to that obtained by a monochromatic blue of wavelength 474–476 nm mixed with white light, i.e., an unsaturated blue light.[2] BLUE SKY GOOD.



PDF: Visible Light and UV Radiation
by Johan Moan, U of Oslo



What percent age of natural sunlight is UV rays?
http://www.madsci.or...64750.En.r.html
The short version is that the amount of UV radiation (wavelength between 100 and 400 nm) reaching the earth's surface is about 0.5% of the total amount of solar radiation reaching the earth's surface.



Solar Spectral Irradiance
http://rredc.nrel.go.../spectra/am1.5/
http://rredc.nrel.go...ar/spectra/am0/
http://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Solar_spectrum_en.svg/500px-Solar_spectrum_en.svg.png

Posted Image



Blue Sky, Rayleigh & Mie Scattering
http://hyperphysics....mos/blusky.html
Andrea G. Blum
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#2 nfoto

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Posted 25 April 2015 - 19:39

0.5% re visible is equivalent to approx. -8 EV. Thus our practical experience gained with UV photography is in the ballpark of that estimate.
Bjørn Birna Rørslett

#3 Andrea B.

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Posted 26 April 2015 - 18:10

oh hi !! I was just parking some notes here.

I was attempting to determine what percentage of sunlight was blue and what % is green.
Andrea G. Blum
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#4 Andrea B.

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Posted 12 August 2017 - 16:36

Cleaned up and retitled this post which has some good solar links.
Andrea G. Blum
Often found hanging out with flowers & bees.