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
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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
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From: "Erik Moore" <[email protected]>
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