[Radiance-general] Discomfort Glare - How do I evaluate

[Martin Moeck]

UGR should be <=20
VCP >= 67

All glare ratings are related. 

UGR is most widely used. It would be appropriate for small skylights.
The Glare Index System was used in Great Britain, Belgium, South Africa and (slightly modified) in Scandinavia. As a recommendation, nowhere in the visual field should the luminance of any bright area exceed 40 times the luminance of  the visual task. 


Martin Moeck


-----Original Message-----
From:	furry at ihug.com.au [mailto:furry at ihug.com.au]
Sent:	Tue 1/18/2005 5:26 PM
To:	radiance-general at radiance-online.org
Cc:	
Subject:	[Radiance-general] Discomfort Glare - How do I evaluate
Hi all,

I working on a glare study with reflected sunlight through a skylight causing 
glare and we are evaluating different glass, laminates and meshes to mitigate 
problems from the glare.

When I use Radiance to evaluate each view, I can get the results for:
- Guth Visual Comfort Probability,
- CIE Glare Index (Einhorn)
- Unified Glare Rating.

What I would appreciate some advice on is which is the most appropriate in this 
case for determining when glare has been reduced to a generally acceptable 
level.  Also, I am wondering what values would be considered acceptable for 
each of these 3 methods of determining glare (ie. VCP > 70% or 50% ??? .. what 
is generally considered acceptable?).

Thanks for your help,
Richard




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