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UltravioletPhotography

[SOL] Various Links to Solar Info


Andrea B.

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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

 

http://rredc.nrel.gov/solar/spectra/am1.5/ASTMG173.JPG

 


Blue Sky, Rayleigh & Mie Scattering

http://hyperphysics....mos/blusky.html

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

 

I was attempting to determine what percentage of sunlight was blue and what % is green.

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  • 2 years later...

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