ULOR & ULR value difference

questions regarding the handling of DIALux evo. (features, tools, options, settings)
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Joined: Wed Sep 19, 2018 6:16 pm

ULOR & ULR value difference

Post by TASOS SOT » Wed Sep 04, 2019 10:06 am


In dialux EVO street lighting mode when the LOR of a luminaire is different than 100% (i.e. conventional street luminaires), the values of ULOR and ULR are different.

How this difference is explained? Is there specific definition for the calculation of the values that EVO use?

Thank you in advance,


Posts: 1402
Joined: Thu Jul 26, 2012 10:16 am

Re: ULOR & ULR value difference

Post by T.Magenheimer » Fri Sep 06, 2019 8:11 am

Dear Tasos,

With ULOR, the operating efficiency is also taken into account. Therefore there are different values to the ULR if the LOR is not 1. The appropriate calculation can be found in the Light Pollution Handbook.

ULR_ULOR.PNG (200.2 KiB) Viewed 876 times

Best regards,
Your DIAL Support Team


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