[Radiance-general] Re: Calculating maximum illuminance levels from daylight

[Ben Masters]

Thanks John,

I understand what you are proposing and have read your thesis previously 
during my studies.

Local weather information available contains data for an average or 
typical year. The sky may not be sunny during the time when the building 
has the highest level of solar exposure (Winter solstice). Since the CIE 
Clear Sky represents an extreme sky condition I thought I could pretty 
much cover the worst case scenario, not actual measured irradiance data.

So, I am still unsure weather Radiance or Gensky will automatically 
calculate the direct and diffuse illuminance given a clear sky, time 
location etc. and if it does will these numbers be realistic or 
theoretical? I am not concerned about overdesigning to handle an extreme 
sky condition.

Surely once light from the sun has penetrated the earths atmosphere it is 
at a constant level, varying in intensity by solar altitude (cosine law).

Thanks,
Ben
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