[Radiance-general] How to model a desk top lamp?

[J. David Maino]

Steen,

I've found that the easiest way to deal with situations like this is to 
use some sort of forward ray-tracing program such as TracePro to model 
the luminaire you want with the materials that you want. Some of them 
get quite in-depth with their materials libraries, so specifying exactly 
what you want is generally not a problem. You should also be able to 
define the source you want and set the lamp lumens appropriately. After 
running the simulation, you can then output the distribution to an IES 
file for use in Radiance. I'm sure there are ways to do this strictly in 
radiance as well, but I'm not as familiar with the methods you might 
use. If anyone else has experience using only radiance for this sort of 
thing I would also be interested to hear how you did it as well.

Dave

Steen Traberg-Borup wrote:

>Dear Radiance users!
>
>How do one make a model of a desk top lamp using Radiance. I know the type of flourescent tube I want to use (lenght, diameter, Ra-value and lumen) , but I don't know the shape of the reflector yet. I want to optimize the reflector shape and the way it is mounted in relation to the flourescent tube and optionally generate an ISO-lux diagram for the work plane and also to generate an ISO-lux table for import in Excel.
>
>I have browsed Radiance-Online for "luminaire" and "lamp" just to find out that modelling luminaires/lamps always start with using an IESNA candlepower file which I don't have. So where do I start?
>
>Best regards,
>
>Steen Traberg-Borup
>
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>Steen Traberg-Borup                   Phone:          +45 45865533
>Danish Building Research Institute    Direct phone:   +45 45742380
>Department of Health and Comfort      Fax:            +45 45867535
>Dr. Neergaardsvej 15                  E-mail:           stb at sbi.dk
>DK 2970 Horsholm                      URL:       http://www.sbi.dk
>Denmark
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