[Radiance-general] UDI upper limits

[Kevin Van Den Wymelenberg]

HMG research has not found an upper limit that relates to human subjective
responses with regard to glare or excessive daylight.

1. Heschong, L. Heschong Mahone Group.2012. Daylight Metrics. California
Energy Commission. Publication number: CEC-500-2012-053.
2. Saxena, M. et al., 2010. 61 Flavors of Daylight. In The Climate for
Efficiency is Now. 2010 ACEEE Summer Study on Energy Efficiency in
Buildings. Asilomar, CA: ACEEE Summer Study on Energy Efficiency in
Buildings, pp. 3.348­3.361.
 

Some of my human factors research has shown very high levels can be
Œpreferred¹ but does lend some support for an upper limit similar to UDI
concept.
³An upper horizontal illuminance comfort-based threshold, as required by
Daylight Saturation Percentage or Useful Daylight Illuminance metrics,
should be set between 2000-4300 lux, but must be applied with an
understanding that some individuals may prefer values as high as 5000 lux
(during some parts of the year), thus confidently identifying only the most
extreme cases as uncomfortable.² (KVDW, 2012)
 
1. Van Den Wymelenberg, K.G., 2012. Evaluating Human Visual Preference and
Performance in an Office Environment Using Luminance-based Metrics.
Dissertation. Seattle, WA: University of Washington. Available at:
http://www.idlboise.com/papers/KevinVanDenWymelenberg-phd.
2. Van Den Wymelenberg, K.G., Inanici, M.N. & Johnson, P.W., 2010. The
Effect of Luminance Distribution Patterns on Occupant Preference in a Daylit
Office Environment. Leukos, 7(2), pp.103­122.
  
I believe Mardaljevic has been considering higher alternative thresholds as
well.





Kevin Van Den Wymelenberg, PhD
Integrated Design Lab ­ Boise, Director
College of Art & Architecture, Assistant Professor
University of Idaho ­ Boise Center
www.uidaho.edu/idl 

ph. 208.724.9456                    fx. 208.343.0001                    306
S. 6th Street                    Boise, ID  83702













From: Rob Guglielmetti <Robert.Guglielmetti at nrel.gov>
Reply-To: Radiance general discussion <radiance-general at radiance-online.org>
Date: Mon, 10 Dec 2012 11:07:54 -0700
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] UDI upper limits

Hey Lars,

I've actually not heard of alternatives to the 2K lux UDI-e limit. Where
have you seen these proposed? Does John M. wanna weigh in on this?
 

Rob Guglielmetti
National Renewable Energy Laboratory (NREL)
Commercial Buildings Research Group
15013 Denver West Parkway MS:RSF202
Golden, CO 80401
303.275.4319
robert.guglielmetti at nrel.gov






On 12/10/12 7:07 AM, "Lars O. Grobe" <grobe at gmx.net> wrote:

>Hi all,
>
>I have seen several definitions of the UDI illuminance ranges around,
>with "UDI-e" (exceed) starting at 2000, 2500 or 3000lx. I really wonder
>what is the commonly used range these days? Can anyone here share some
>insight on this moving target for daylighting optimizations? ;)
>
>Cheers, Lars.
>_______________________________________________
>Radiance-general mailing list
>Radiance-general at radiance-online.org
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