[Radiance-general] glare uplift

[Greg Ward]

Hi Erik,

If you assume a 400 lux level averaged over room surfaces, and 40%  
average reflectance, you get:

	400 lux * 40% / pi / 179 lm/watt

= 0.28 watts/sr/meter^2

which is the value you give to the -av option (i.e., -av 0.28 0.28  
0.28).

-Greg

> From: "Erik Moore" <Erik.Moore at arup.com>
> Date: August 25, 2008 4:08:02 AM PDT
> Hi all, I’m doing some glare calculations for the first time and am  
> in general new to Radiance. I’m trying to work out how to take  
> account of the ambient lighting level within a room when I’m  
> performing a glare calc for daylighting? Is it using the –av  
> setting, and if so, how do I convert the internal light level of  
> 400lux into a –av setting? Thanks, Erik