glare

i have a basic question. m sorry if its elementary.. m just little confused

evalglare gives values dgp,dgi,ugr,vcp,cgi ...

my doubt is what is the difference between dgp and dgi (Daylight Glare
probability and Daylight Glare Index)

both give the number values... but probability and index... what do we
follow ... dgi gives the index of comfortable, tolerbale and so on ...and
what about dgp?

would be of great help if the confusion in me is cleared.

thanks
dhaRam

dhaRam,

I would look to Jan's dissertation as the main reference:

http://www.ise.fraunhofer.de/veroeffentlichungen/nach-jahrgaengen/2010/buecher-und-beitraege-zu-buechern/daylight-glare-in-offices

Mostapha

···

On Thu, Sep 8, 2011 at 7:29 AM, dharam <[email protected]> wrote:

i have a basic question. m sorry if its elementary.. m just little confused

evalglare gives values dgp,dgi,ugr,vcp,cgi ...

my doubt is what is the difference between dgp and dgi (Daylight Glare
probability and Daylight Glare Index)

both give the number values... but probability and index... what do we
follow ... dgi gives the index of comfortable, tolerbale and so on ...and
what about dgp?

would be of great help if the confusion in me is cleared.

thanks
dhaRam

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In short, both DGI and DGP are intended to do the same (index of comfort, or tolerable glare as you say), but in the Wienold dissertation that Mostapha references, the DGP is found to have better correlation to actual user perception than DGI.

http://www.ise.fraunhofer.de/veroeffentlichungen/nach-jahrgaengen/2010/buecher-und-beitraege-zu-buechern/daylight-glare-in-offices

···

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thank you..

il refer the same and carry on further work...

thanks

Keep in mind that Wienold's study was limited to shallow floor plate office environments and glare from daylight specifically. It is great work, but you need to keep the context in mind when considering the metric.

- Rob

Rob Guglielmetti IESNA, LEED AP
Commercial Buildings Research Group
National Renewable Energy Laboratory
1617 Cole Blvd MS:RSF202
Golden, CO 80401
T. 303.275.4319
F. 303.630.2055
E. [email protected]

···

On 9/8/11 8:17 AM, "Christopher Rush" <[email protected]<mailto:[email protected]>> wrote:

In short, both DGI and DGP are intended to do the same (index of comfort, or tolerable glare as you say), but in the Wienold dissertation that Mostapha references, the DGP is found to have better correlation to actual user perception than DGI.

http://www.ise.fraunhofer.de/veroeffentlichungen/nach-jahrgaengen/2010/buecher-und-beitraege-zu-buechern/daylight-glare-in-offices
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