[Radiance-general] Questionaire on fluorescent lamp

[Giulio Antonutto]

try to have a look for the -ds setting...

 

if this still a problem for your application I'd investigate the use of
'glow' (0 0 4 r g b 0) in conjunction with an indirect calculation (-ab
n, n>0) 

 

to avoid ambient cache problems you may switch to -aa 0 -u  but this
will require over sampling of your grid to remove Montecarlo noise.

 

hope this makes sense,

 

ciao

 

G.

 

 

 

________________________________

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Minki
Sung
Sent: 15 October 2007 12:16
To: radiance-general at radiance-online.org
Subject: [Radiance-general] Questionaire on fluorescent lamp

 

Hello Everybody,

 

It's my first time to mail to the radiance mailing list.

I'm using Radiance to calculate near field illuminance (in fact
radiation) from bare fluorescent lamps.

Before doing with real mode data, I tested one with a bare fluorescent
lamp and a plan 20 centimeter away from the long and cylindrical lamp.
But the result right under the lamp was strange, that is, the other
values were as I expected but only in the area directly under the lamp
the illuminance was highest at the center and decreased gradiently as
went to the end of the lamp. For example, the illuminance was 5000 lux
at the center right under the lamp, but it decreased to 15 lux at a
quarter point of the lamp, though the two would be almost same. 

Maybe I am not understanding properly the lamp description. Can you
anyone explain this to me? Or Radiance is not adequate for near field
calculation with long cylindrical lamp?

 

Best Regards

 

Minki Sung

 

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