[Radiance-general] 3. Re: GR Observer (Greg Ward)
Jan Wienold
jan.wienold at epfl.ch
Fri May 18 02:33:57 PDT 2018
Hi Josef,
Lvl of the equation is the veiling luminance according to
Stiles-Holladay and used in the CIE publications for disability glare.
You can calculate Lvl by evalglare, it is one of the outputs if you use
the -d option. the evalglare output is called "Lveil_cie", dont mix it
up with "Lveil", which is the disability equation according to Pointer
and differs a lot to the CIE equation.
For your configuration, I would de-activate the peak extraction (by
using the -x option) and use a meaningful absolute threshold for glare
source detection (e.g. 2000 cd/m2).
The second part of the GR equation (Lve) cannot be solved by
image-evaluation automatically, since it uses the average horizontal
illuminance (not vertical). So you have to measure it separately and
calculate the GR manually.
The bigger challenge is to measure accurately this situations with a HDR
camera, since you will deal very probably with flicker (discharging
lamps, led..). As a general rule you need to restrict the shortest
exposure time to 10/f (f: frequency of the flicker). At the same time
should be the maximum pixel value of the shortest exposure time not more
than 200 (better lower) to avoid pixel overflow.
For high luminance light sources it is hard to comply with both rules at
the same time. So you have to check, if you need to use a filter and use
longer exposure times.
A second thing you have to consider is, that you need to have the right
lens type description in the header of the hdr image ("VIEW=...") ,
otherwise the angles (e.g. angle between line of sight=center of image
and the glare source or all solid angles) are not correctly calculated
by any software (findglare, evalglare). For perspective lenses you need
to check the viewing angles. This should be done by measurements, since
manufacturers information or not always correct and the angles might
differ for the same lens for different cameras attached to it.
Good luck!
Jan
On 18.05.18 10:22, N. Nassif wrote:
> Hey,
>
> I found this online from AGI32:
>
> https://docs.agi32.com/AGi32/Content/adding_calculation_points/Calculations_Glare_Rating_Concepts.htm
>
> The Formula is GR = 27 + 24 lg (LVL/LVE ^0.9)
>
> I checked the ones you sent (findglare and glarendx ), but I did see
> it, or am I mistaken?
>
> Thank you!
>
> Mit freundlichen Grüssen,
>
> Josef.Nassif
>
> Dipl.-Ing. Elektrotechnik
>
> MA(FH) Architectural Lighting Design
>
>
> 2018-05-18 2:51 GMT+02:00
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> Today's Topics:
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> 1. GR Observer (N. Nassif)
> 2. Re: Daylight Award! (Mudit Saxena)
> 3. Re: GR Observer (Greg Ward)
> 4. Re: Daylight Award! (Amarpreet Sethi)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 17 May 2018 22:15:55 +0200
> From: "N. Nassif" <nynassif at gmail.com <mailto:nynassif at gmail.com>>
> To: radiance-general at radiance-online.org
> <mailto:radiance-general at radiance-online.org>
> Subject: [Radiance-general] GR Observer
> Message-ID:
>
> <CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA at mail.gmail.com
> <mailto:CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA at mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
>
> Hey Community,
>
> is there a way to calculate the *GR *Observer (Glare Rating) in
> Radiance?
> GR is the measure of glare in exterior spaces.
>
> My attempt is to use HDR photos and analyze a scene in exterior,
> mainly at
> an Airport field: Apron, Aircraft Stands.
>
> Thank you in advance,
>
> and Congrats GREG! :)
>
> Mit freundlichen Gr?ssen,
>
>
>
> Josef.Nassif
>
> Dipl.-Ing. Elektrotechnik
>
> MA(FH) Architectural Lighting Design
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> ------------------------------
>
> Message: 2
> Date: Thu, 17 May 2018 13:24:02 -0700
> From: Mudit Saxena <msaxena at vistar-energy.com
> <mailto:msaxena at vistar-energy.com>>
> To: Radiance general discussion
> <radiance-general at radiance-online.org
> <mailto:radiance-general at radiance-online.org>>
> Subject: Re: [Radiance-general] Daylight Award!
> Message-ID:
> <395BEEEC-1877-4B61-8142-DFF71794A413 at vistar-energy.com
> <mailto:395BEEEC-1877-4B61-8142-DFF71794A413 at vistar-energy.com>>
> Content-Type: text/plain; charset="utf-8"
>
> This made my day!! So well deserved Greg!! Your humble response
> reminds us just why you deserve this award. Your selfless and
> devoted support of the Radiance community over the years has
> helped countless people. I hope I can echo some of those people in
> saying Thank You and Congratulations!
>
>
> Mudit Saxena
> Principal, Vistar Energy
> www.vistar-energy.com <http://www.vistar-energy.com>
> +1 (916) 543-7186 | MSaxena at vistar-energy.com
> <mailto:MSaxena at vistar-energy.com>
>
>
> > On May 17, 2018, at 8:34 AM, Randolph M. Fritz
> <rmfritz3 at gmail.com <mailto:rmfritz3 at gmail.com>> wrote:
> >
> > Congratulations, Greg!
> >
> > --
> > Randolph M. Fritz || +1 206 659-8617 || rmfritz3 at gmail.com
> <mailto:rmfritz3 at gmail.com>
> >
> >> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell
> <Galen.Burrell at arup.com <mailto:Galen.Burrell at arup.com>> wrote:
> >> Congratulations to Greg Ward for receiving the prestigious 2018
> Velux Daylight Award for Daylight Research!
> >>
> >>
> >>
> >> http://www.thedaylightaward.com/laureates/
> <http://www.thedaylightaward.com/laureates/>
> >>
> >>
> >>
> >> I?m sure all of us on this list could not imagine a more
> deserving recipient for this award given his contributions to the
> field, and the legacy he has created with Radiance.
> >>
> >>
> >>
> >> Congrats Greg!
> >>
> >>
> >>
> >> --
> >>
> >> Galen Burrell LEED AP
> >>
> >> Senior Designer | Lighting
> >>
> >>
> >>
> >> Arup
> >>
> >> t: +1 415 957 9445 d: +1 415 946 2367
> >>
> >> m: +1 415 906 9191
> >>
> >> www.arup.com <http://www.arup.com>
> >>
> >>
> >>
> >> ____________________________________________________________
> >> Electronic mail messages entering and leaving Arup business
> >> systems are scanned for viruses and acceptability of content
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> ------------------------------
>
> Message: 3
> Date: Thu, 17 May 2018 15:21:41 -0700
> From: Greg Ward <gregoryjward at gmail.com
> <mailto:gregoryjward at gmail.com>>
> To: Radiance general discussion
> <radiance-general at radiance-online.org
> <mailto:radiance-general at radiance-online.org>>
> Subject: Re: [Radiance-general] GR Observer
> Message-ID: <E30D7279-28DB-4A50-9960-1B0E586BCBFB at lmi.net
> <mailto:E30D7279-28DB-4A50-9960-1B0E586BCBFB at lmi.net>>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thanks, Josef.
>
> Do you happen to have a reference or a formula for GR? It's not
> the same as UGR, is it? There are so many glare indices, and the
> findglare and
>
> glarendx programs can be combined to compute several of them from
> HDR images or renderings, but I don't know about this one.
>
> Cheers,
> -Greg
>
> > From: "N. Nassif" <nynassif at gmail.com <mailto:nynassif at gmail.com>>
> > Date: May 17, 2018 1:15:55 PM PDT
> >
> > Hey Community,
> >
> > is there a way to calculate the GR Observer (Glare Rating) in
> Radiance? GR is the measure of glare in exterior spaces.
> >
> > My attempt is to use HDR photos and analyze a scene in exterior,
> mainly at an Airport field: Apron, Aircraft Stands.
> >
> > Thank you in advance,
> >
> > and Congrats GREG! :)
> >
> > Mit freundlichen Gr?ssen,
> >
> > Josef.Nassif
> > Dipl.-Ing. Elektrotechnik
> > MA(FH) Architectural Lighting Design
> -------------- next part --------------
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> ------------------------------
>
> Message: 4
> Date: Fri, 18 May 2018 00:51:25 +0000
> From: Amarpreet Sethi <amarpreet_s at hotmail.com
> <mailto:amarpreet_s at hotmail.com>>
> To: Radiance general discussion
> <radiance-general at radiance-online.org
> <mailto:radiance-general at radiance-online.org>>
> Subject: Re: [Radiance-general] Daylight Award!
> Message-ID:
>
> <MWHPR14MB14212B9EB21F3137268D5C0D8A900 at MWHPR14MB1421.namprd14.prod.outlook.com
> <mailto:MWHPR14MB14212B9EB21F3137268D5C0D8A900 at MWHPR14MB1421.namprd14.prod.outlook.com>>
>
> Content-Type: text/plain; charset="utf-8"
>
> Congratulations Greg and THANKYOU!!!
>
> Amarpreet
>
> On May 17, 2018, at 3:12 PM, Mudit Saxena
> <msaxena at vistar-energy.com
> <mailto:msaxena at vistar-energy.com><mailto:msaxena at vistar-energy.com
> <mailto:msaxena at vistar-energy.com>>> wrote:
>
> This made my day!! So well deserved Greg!! Your humble response
> reminds us just why you deserve this award. Your selfless and
> devoted support of the Radiance community over the years has
> helped countless people. I hope I can echo some of those people in
> saying Thank You and Congratulations!
>
>
> Mudit Saxena
> Principal, Vistar Energy
> www.vistar-energy.com
> <http://www.vistar-energy.com><http://www.vistar-energy.com
> <http://www.vistar-energy.com>>
> +1 (916) 543-7186 | MSaxena at vistar-energy.com
> <mailto:MSaxena at vistar-energy.com><mailto:MSaxena at vistar-energy.com
> <mailto:MSaxena at vistar-energy.com>>
>
>
> On May 17, 2018, at 8:34 AM, Randolph M. Fritz <rmfritz3 at gmail.com
> <mailto:rmfritz3 at gmail.com><mailto:rmfritz3 at gmail.com
> <mailto:rmfritz3 at gmail.com>>> wrote:
>
> Congratulations, Greg!
>
> --
> Randolph M. Fritz || +1 206 659-8617 || rmfritz3 at gmail.com
> <mailto:rmfritz3 at gmail.com><mailto:rmfritz3 at gmail.com
> <mailto:rmfritz3 at gmail.com>>
>
> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell
> <Galen.Burrell at arup.com
> <mailto:Galen.Burrell at arup.com><mailto:Galen.Burrell at arup.com
> <mailto:Galen.Burrell at arup.com>>> wrote:
> Congratulations to Greg Ward for receiving the prestigious 2018
> Velux Daylight Award for Daylight Research!
>
> http://www.thedaylightaward.com/laureates/
> <http://www.thedaylightaward.com/laureates/>
>
> I?m sure all of us on this list could not imagine a more deserving
> recipient for this award given his contributions to the field, and
> the legacy he has created with Radiance.
>
> Congrats Greg!
>
> --
> Galen Burrell LEED AP
> Senior Designer | Lighting
>
> Arup
> t: +1 415 957 9445 d: +1 415 946 2367
> m: +1 415 906 9191
> www.arup.com <http://www.arup.com> <http://www.arup.com/>
>
>
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup business
> systems are scanned for viruses and acceptability of content
>
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--
Dr.-Ing. Jan Wienold
Ecole Polytechnique Fédérale de Lausanne (EPFL)
EPFL ENAC IA LIPID
http://people.epfl.ch/jan.wienold
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