[Radiance-general] How to verify an IES file ?

[Vaib]

Thanks Thomas, Christopher

I have used "ies2rad -dm -t white -m 0.85 TX4948.ies". I will now check
with similar luminaire of another make, and also calculate a representative
Lamp Loss Factor as Thomas suggested.

Best,
Vaib


On 22 May 2014 18:44, Christopher Rush <Christopher.Rush at arup.com> wrote:

>  What command line syntax and options do you use with the ies2rad command
> to create your radiance definition of the light fixture? It could be an
> error with the particular manufacturer’s IES file, if they’ve somehow made
> the IES file incorrect in the process of normalizing the IES file and
> applying the 8.6 multiplier. In other cases IES files are sometimes
> reported with a candela multiplier of 1.0 (instead of normalizing them
> first). Can you test with another manufacturer’s IES file of similar
> distribution, efficiency, and lamp type (maybe Zumtobel Claris).
>
>
>
>
>
> *From:* Vaib [mailto:vaibhavjain.co at gmail.com]
> *Sent:* Thursday, May 22, 2014 6:04 AM
> *To:* Radiance general discussion
> *Subject:* [Radiance-general] How to verify an IES file ?
>
>
>
> Hello Everyone,
>
>
>
> In the following report, the simulated illuminance (artificial lighting)
> is un-reasonably high than the measured illuminance. I suspect that the
> issue may be in the lumen output (or candela multiplier) in the IES file.
> Please have a look at the report.
>
>
>
> Artificial lighting report: http://bit.ly/1qXigtU
>
>
>
> May I request your suggestions on how this issue can be resolved ? How
> much shall I reduce the Candela multiplier, if that is to be done ?
>
>
>
> Best regards,
>
> Vaib
>
>
>
>
>
>
>
>
>
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