[Radiance-general] Stadium light

[Guglielmetti, Robert]

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. robert.guglielmetti at nrel.gov





On 2/3/11 12:52 PM, "Lars O. Grobe" <grobe at gmx.net> 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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