Stadium light

You can convert IES files into Radiance using ies2rad. The output will
typically be a .rad-file, containing a light material, with its angular
distribution modified by a brightfunc modifier, plus a surface that this
light material will be applied to. The second file written by ies2rad
will have a .dat-extension, and it contains the candela distribution a
the input file.

It is somehow easy to introduce errors when working with ies files. Be
especially careful about:

- units(!!)
- about wether your ies file contains absolute values or relative to a
given luminous flux of the source,
- in most cases you want to go with white sources, unless e.g. you
combine different lamps with different color temperatures,
- the coordinate systems in the ies specifications are not all that
obvious, and it is always a good idea to put the source into a simple
scene and look at the illuminance on a plane below and besides for
plausibility checks...

Cheers, Lars.

···

Am Donnerstag, den 03.02.2011, 14:16 -0500 schrieb Tim Metcalfe:

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?

I created ltview for the purpose of doing a quick sanity check that your
ies file got converted properly and is oriented as you expect. It's a hack
of objview, and just puts an open ended box around the light source so you
can observe the distribution.

It assumes feet is the unit of measurement; if you used meters add -bs .62
to scale the box around the luminaire so it's useful. Download here:

http://www.rumblestrip.org/2004/05/10/ltview-a-radiance-utility/

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 2/3/11 12:52 PM, "Lars O. Grobe" <[email protected]> wrote:

Am Donnerstag, den 03.02.2011, 14:16 -0500 schrieb Tim Metcalfe:

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?

You can convert IES files into Radiance using ies2rad. The output will
typically be a .rad-file, containing a light material, with its angular
distribution modified by a brightfunc modifier, plus a surface that this
light material will be applied to. The second file written by ies2rad
will have a .dat-extension, and it contains the candela distribution a
the input file.

It is somehow easy to introduce errors when working with ies files. Be
especially careful about:

- units(!!)
- about wether your ies file contains absolute values or relative to a
given luminous flux of the source,
- in most cases you want to go with white sources, unless e.g. you
combine different lamps with different color temperatures,
- the coordinate systems in the ies specifications are not all that
obvious, and it is always a good idea to put the source into a simple
scene and look at the illuminance on a plane below and besides for
plausibility checks...

Cheers, Lars.

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