[Radiance-general] stainless specular values

[Aaron Zeligs]

Hello Everyone, 

I an architect and am doing a glare analysis and need to accurately simulate different finishes of stainless steel as options. 
I am currently using the following material definition to simulate Stainless Steel w #4 Finish:

# material name:STAINLESS_4
# material type: reflective 
# comment: stainless_4
# author: az
void metal stainless_4
0
0
5 0.8 0.8 0.8 0.9 .125

Im looking to simulate the following types of metal using the the appropriate different specular and roughness values, but don't have any way to accurately test the materials my self
I have had a very hard time finding this information, and do not have the equipment to measure actual samples. 

1) Stainless Steel Polished
2) Stainless Steel #4 finish
3) Stainless Steel Sandblasted
4) Zinc 

Does anyone have any thoughts what the reflectance/roughness values for these type of materials and finishes may be?  Thanks so much for any help


Best, 
-Aaron