[Radiance-general] Modelling lightwell with translucent glazing

[Derek Whitehead]

Hello,

I am a relative newcomer to Radiance, so please forgive my ignorance.

I am interested in simulating a room with a deep lightwell as the only
source. The top of the light well has a double glazed skylight and the
bottom of the lightwell is an as-yet undefined product that produces
diffuse light and has a very high visible light transmittance. My
questions are:

1. Will a light frit or white paint coating on glass transmit highly
diffused light? If not, any products to recommend that will?
2. Will Lamberts cosine law be a reasonable estimate for the BTDF and
BRDF? And what are reasonable peak (zero angle) values to expect?
3. Am I going to run into problems with Radiance finding the light
source? Which inputs will help Radiance find the light?

Thanks for any guidance.
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