[Radiance-general] Use of Lighting information on EPW file

[Germán Molina Larrain]

Dear List, I am not sure this is directly applied to Radiance, but for
lighting it definitively is.

I was checking out some stuff, and started wondering why are we not using
the Lighting information… I am reading
THIS<http://apps1.eere.energy.gov/buildings/energyplus/pdfs/weatherdatainformation.pdf>,
and it says "Illuminance (Global Horizontal, Direct Normal, Diffuse
Horizontal, Zenith Luminance).

My question is: Is there any reason for not using the Direct Normal and the
Diffuse Horizontal information for making calculations instead of using the
Perez Model?

I understand that the Daylight Coefficients would not directly apply since
the luminance distribution would be unknown… Is it too bad to consider the
direct illuminance as it is, and assume the diffuse illuminance as
isotropic (i.e. assume the diffuse daylight entering through my window is
the same as the horizontal) ???

THANKS

Germán Molina
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