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MoonRise said:
Clear sky luminance is about 5.16 cd/in2 (8 kcd/m2) with a color temp of 6000K. That is equivalent to 2332 lumens/ft2, or 25,101 lumens/m2 which is 25,101 lux. (lux is lumen/meter2).
Shifting to photgraphy knowledge, since there are about 2-3 f/stops (each f/stop is a doubling of light) difference between direct sun and clear sky lighting, there would be about 100,000 to 200,000 lux.
The sun puts out a LOT of light. Also some heat. /ubbthreads/images/graemlins/smile.gif
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Does that mean that looking at the sun and looking at a 25,000 lux incan are about the same?