[Radiance-general] SSLD skies and zenith radiance

[Lars O. Grobe]

Hi,

I am looking into the ssld support that Phillip made available, and I 
found the following in the accompagnying documentation:

"4. Select an arbitrary zenith radiance, Z (eg. 100 W/m2/sr)."

What is the meaning of arbitrary here? The value is used later by the 
cal-file creating the distribution. I was hoping to create a 
distribution from the coefficients and the horizontal illuminance, but I 
do not know where to get data on zenith luminance.

Cheers, Lars.
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