[Radiance-general] making my own ies file

[Chris Foster]

Hi Thomas
 
Thanks for getting back to me, ill look on the website.
 
i havent actually contacted the manufacturer directly (its arri out of interest; http://www.arri.com/entry/lighting.htm), would be wise to but i thought i would learn more by making my own. They didnt have an ies file on the website that i could find, just this photometric data page. 
after looking at your suggested website (which is very good thankyou) the description of lumens per lamp isnt given by arri so i'll have to request an ies file afterall
 
Thanks again
 
Chris

-----Original Message-----
From: radiance-general-bounces at radiance-online.org [mailto:radiance-general-bounces at radiance-online.org]On Behalf Of Bleicher, Thomas
Sent: 03 August 2006 09:40
To: Radiance general discussion
Subject: RE: [Radiance-general] making my own ies file


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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