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

[Christopher Rush]

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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