[Radiance-general] making my own ies file

[Bleicher, Thomas]

Chris.
 
You can find the description of the IES file standard in the appendix of
this
document:
 
http://www.helios32.com/Thinking%20Photometrically%20II.pdf
 
PS: Did the manufacturer not offer IES files directly?
      Seems strange if they had the raw data.
 
Thomas


  _____  

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Chris
Foster
Sent: 03 August 2006 09:33
To: Radiance general discussion
Subject: [Radiance-general] making my own ies file


Hello again, 
 
Im making my own ies file for a spotlight i am using in a lab from data
i found at the manufacturers website. i have a graph of angle against
brightness and i know the format of such a file from readin RwR. however
i can seem to find a description for some of the values needed, either
in the book or in the online manuels
 
the file i have made so far looks as so, but the text in square brackets
are the values im not sure of (ignore the oridnary parenthesis, i simply
havent measured my spotlight yet.). i havent got access to the iesna
standard and so was wondering if anyone on the list has knowledge of
this area.
 
TILT=NONE
 
1 [lumens per lamp] [candela multiplier] 11 [photometric type] [units
type] (w) (l) (h)
[ballast factor] 1 4000
0 0.5 1.5 3 4 5 6 7.5 9 11 17
0
1880000 1800000 1600000 1000000 600000 400000 250000 120000 100000 60000
0
 
i think that all the square bracket values have to be 1, but the one im
most unsure of is the lumens per lamp value. this is most definately not
1, does anyone know what this is and how i calculate this for my
spotlight??
 
thanks in advance, any help much appreciated as usual (wish i could give
something back!).
 
Chris
 
p.s. still havent solved my last email either if anyone has any
suggestions...
 
 
 



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