[Radiance-general] Calculating luminance of surface

[Florian Wochele]

Hello Greg,
unfortunately we don't have the BRDF (at least not yet). What kind of 
assumptions are you talking about? Maybe we can still use the solution 
in reference to those assumptions.
/Florian

Am 03.03.2017 um 19:21 schrieb Greg Ward:
> The quantity you are asking for, luminance as a function of incident 
> illuminance, is precisely what the BRDF (bidirectional reflectance 
> distribution function) tells you.  If you have the BRDF of your panel, 
> you can compute the luminance directly from illuminance and incident 
> direction.  If you do not, you cannot compute the luminance without 
> making some (likely wrong) assumptions.
>
> -Greg
>
>> *From: *Florian Wochele <emb15fwo at student.lu.se 
>> <mailto:emb15fwo at student.lu.se>>
>>
>> *Date: *March 3, 2017 1:24:56 AM PST
>>
>> *
>> *
>>
>> Dear Sir or Madam,
>>
>> We are working on our master thesis at Lund University about Glare 
>> from reflections on PV panels. To evaluate whether glare occurs or 
>> not, we need the luminance of the reflection on the surface the PV 
>> panel reflects light on. However we only get the illuminance of the 
>> sun (light source). How can we translate the illuminance from the sun 
>> to the luminance of the surface? There has to be a way since we can 
>> get the luminance via simulations, however we are interested in a way 
>> to calculate the luminance. We also have to take into account that PV 
>> panels are neither perfectly specular nor perfectly diffuse.
>>
>> Best regards,
>>
>> Erik Hjorth and Florian Wochele
>>
>
>
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