Hi all,

to start with, I am using the Radiance tool as implemented in a
different software suite, but I imagine that this is fairly
irrelevant.

I am looking at daylight factors in classrooms using CIE uniform sky,
and at the use of light wells to "brighten up" the back of deep
classrooms. I want the maximum amount of light possible been
channeled down the light well, so I thought that some aluminium foil
coating could be used. For this coating I used the following values:
R-Refl = 0.91, B-Refl = 0.92, G-Refl = 0.92 (this is roughly the
reflectance of polished aluminium at the different wavelength for
Red, Green, Blue). For specularity.... I took the average of the 3
values, so I used 0.917 (this is a pure guess, but I thought that a
value of between 0.9 and 1.0 would have been appropriate - ok maybe
1.0 would have been too optimistic, so any 0.9, 0.925, 0.95 would
have been good). I assumed the surface to be polished, hence
roughness = 0.

Is this approach valid.. or did I completely miss the point?
Where can I find some guidance? For example, how would I go to
simulate a mirror?

many thanks,

willy