[Radiance-general] Simulating Prismatic Diffuser

[Greg Ward]

Agreeing with the others, Radiance is not the ideal tool for modeling  
a fluorescent luminaire with a prismatic panel, but it can be done.   
You have to know a lot of details about the geometry and materials  
involved, but this is a case where mkillum may work reasonably well.   
That isn't to say the whole thing is straightforward.

You are much better off either measuring the luminaire somehow, or  
using an IES luminaire file belonging to something similar.

Best,
-Greg

> From: "Shariful Shikder" <shikders at Cardiff.ac.uk>
> Date: December 5, 2007 2:10:51 AM PST
>
> Dear All,
>
> I am trying to simulate a 'prismatic diffuser' of a flourescent  
> luminaire. Anyone can let me know which would be the best way to  
> model it. Some questions I have regarding this are:
>
> - Is there any material readily available that I can try to use and  
> validate in my case? As I am not very expert in Radiance materials,  
> this would help me to learn things.
> - Which Radiance material would define a 'prismatic diffuser' well ?
> - Is there any good reference or text to understand well the Trans,  
> Transdata, BRTDFunc etc. etc. diffuser related matters ??
>
> Any suggestion would be fine ....
>
> Thanks,
> Sharif