Radiance-general Digest, Vol 83, Issue 23

radiance-general
1

I have the ies file for an electric lightsource how do I put it into ecotect to use it or convert it to rad file?
Any help would be great

Tim Metcalfe
Kalwall Corporation
Daylight Modeling Group
1111 Candia Road
Manchester, N.H. 03105
1(800)258-9777 X4483
 Please consider your environmental responsibility before printing this e-mail

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Sent: Monday, January 31, 2011 3:00 PM
To: [email protected]
Subject: Radiance-general Digest, Vol 83, Issue 23

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Today's Topics:

   1. trans material file (Tim Metcalfe)
   2. stadium light (was: trans material file) (Lars O. Grobe)
   3. Stadium light [was: trans material file] (Thomas Bleicher)
   4. Re: Stadium light [was: trans material file]
      (Guglielmetti, Robert)

----------------------------------------------------------------------

Message: 1
Date: Mon, 31 Jan 2011 06:41:18 -0500
From: Tim Metcalfe <[email protected]>
To: "[email protected]"
        <[email protected]>
Subject: [Radiance-general] trans material file
Message-ID:
        <31A1F951[email protected]>
Content-Type: text/plain; charset="us-ascii"

Hello all,
I am looking to write a file to import in Ecotect for a 75 fc electric stadium light.
Since electric lights are not my usual I am at a loss. Any suggestions?

Tim Metcalfe
Kalwall Corporation
Daylight Modeling Group
1111 Candia Road
Manchester, N.H. 03105
1(800)258-9777 X4483
P Please consider your environmental responsibility before printing this e-mail

________________________________
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
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Message: 2
Date: Mon, 31 Jan 2011 13:01:10 +0100
From: "Lars O. Grobe" <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: [Radiance-general] stadium light (was: trans material file)
Message-ID: <1296475270.6067.20.camel@lars-laptop>
Content-Type: text/plain; charset="UTF-8"

Hi Tim!

I am looking to write a file to import in Ecotect for a 75 fc electric
stadium light.

What information on that stadium light do you have? Do you have a
candela distribution (either as a print-out or as an IES or Eulumdat
file)?

Cheers, Lars.

BTW I changed the subject line, I guess this thread is not about trans
material questions.

------------------------------

Message: 3
Date: Mon, 31 Jan 2011 08:31:30 -0500
From: Thomas Bleicher <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: [Radiance-general] Stadium light [was: trans material file]
Message-ID:
        <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1

On Mon, Jan 31, 2011 at 6:41 AM, Tim Metcalfe <[email protected]> wrote:

Hello all,

I am looking to write a file to import in Ecotect for a 75 fc electric
stadium light.

Since electric lights are not my usual I am at a loss. Any suggestions?

Tim. I hope you are looking just for a way to import distribution data
into Ecotect.

In that case, IES is your friend. IIRC you define it as a type of
material in Ecotect. If you go through the materials you should find
some examples for "light materials" which should get you going.

If you want to roll your own IES file ...

Are you sure about this? If you have a fitting that's safety-tested
enough to go in a stadium you should be able to get an IES file. If
not I would still look for a distribution file of a similar fitting
before I start to hack together my own IES file.

If you really want to dive into it I recommend "Thinking
Photometrically (II)" by Ian Ashdown as first start:

http://www.dial.de/CMS/German/Articles/Licht/Service/Downloads/Thinking_Photometrically_II.pdf

Good luck,
Thomas

------------------------------

Message: 4
Date: Mon, 31 Jan 2011 09:53:26 -0700
From: "Guglielmetti, Robert" <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Stadium light [was: trans material
        file]
Message-ID: <C96C35E7.30AB%[email protected]>
Content-Type: text/plain; charset="us-ascii"

I don't think it's all that difficult to create an IES file from scratch
(assuming one has a proper test report and either IES LM-63 or Ian's great
paper that Thomas cites below). Lighting Analysts has a nice piece of
software called "Photometric Toolbox" that guides you through the process
of generating your own IES file as well. But again, this assumes you have
a photometric test report with all the candela values in hand. If you
don't have that, Thomas' suggestion of trying to find a similar product
that has been tested is the way to go.

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 1/31/11 6:31 AM, "Thomas Bleicher" <[email protected]> wrote:

On Mon, Jan 31, 2011 at 6:41 AM, Tim Metcalfe <[email protected]> >wrote:

Hello all,

I am looking to write a file to import in Ecotect for a 75 fc electric
stadium light.

Since electric lights are not my usual I am at a loss. Any suggestions?

Tim. I hope you are looking just for a way to import distribution data
into Ecotect.

In that case, IES is your friend. IIRC you define it as a type of
material in Ecotect. If you go through the materials you should find
some examples for "light materials" which should get you going.

If you want to roll your own IES file ...

Are you sure about this? If you have a fitting that's safety-tested
enough to go in a stadium you should be able to get an IES file. If
not I would still look for a distribution file of a similar fitting
before I start to hack together my own IES file.

If you really want to dive into it I recommend "Thinking
Photometrically (II)" by Ian Ashdown as first start:

http://www.dial.de/CMS/German/Articles/Licht/Service/Downloads/Thinking_Ph
otometrically_II.pdf

Good luck,
Thomas

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End of Radiance-general Digest, Vol 83, Issue 23
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2

I'm not a big user of Ecotect so my preferred workflow is this:

1) in Ecotect place and direct light objects where you want the IES
fitting to be. Use the same type of light for one type of fitting.

2) When you export to Radiance you get the option to export lights as
markers. This creates triangles with the correct rotation which you
can use with "replmarks".

2b) I think the lights are always exported last so you can edit your
exported scene.rad file and split it into a geometry.rad and
markers.rad. Makes it easier to update the geometry when the fittings
stay in the same place.

3) convert the IES file to a Radiance file with ies2rad:

$ ies2rad -t WHITE -m 0.7 myfitting.ies

This will create a myfitting.rad and myfitting.dat file which describe
a light source with 70% output of the values in the IES file. The -m
option is the best way to apply depreciation factors.

4) now use replmarks to replace the triangles in the "markers.rad"
file with the light source description:

$ replmarks -x myfitting.rad Light.123.4 markers.rad > lights.rad

"Light.123.4" is the modifier that was assigned to the triangles by
Ecotect. This should have some resemblance to the light type you used
when you placed the lights.

5) do the usual Radiance stuff with the new scene files:

oconv geometry.rad lights.rad > scene.oct
rvu scene.oct # to check that there are lights in the scene
[rpict/rtrace as desired]

The benefit of this method is that you can control each step and
modify the output or type of the light fittings. If you define and
export the lights in Ecotect you have to replace the whole scene
whenever you make a change to the fitting.

Regards,
Thomas

···

On Thu, Feb 3, 2011 at 2:16 PM, Tim Metcalfe <[email protected]> wrote:

I have the ies file for an electric lightsource how do I put
it into ecotect to use it or convert it to rad file?