[Radiance-general] Daylight factor

[Christopher Rush]

It would help to know your command process for calculating illuminance
and daylight factor to troubleshoot.

 

Also, if your rpict/rtrace ambient sampling settings are not stringent
enough, differences could be due to random sampling variation between
two different calculation runs.

 

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
Victor Li
Sent: Thursday, December 10, 2009 4:04 AM
To: Radiance general discussion
Subject: [Radiance-general] Daylight factor

 

Dear:

Daylight factors are expressed as the percentage of natural light
falling on a work surface compared to that which would have fallen on a
completely unobstructed horizontal surface under exactly the same sky
conditions. Thus, a daylight factor of 5% on an internal surface means
that it received only 1/20th of the maximum available natural light.

so we can calculate daylight factor by RADIANCE with a overcast sky.
Then i calculated the illuminance under overcast sky. I found the
distribution of illuminance and skyfactor in the room is different. For
example, in the room ratio of minimum to average of daylight and
illuminance are quite different. Would you tell me the reason?

Best Regards!

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