[Radiance-general] making my own ies file

[Chris Foster]

Hi Dave

yeah i know what type of lamp, it was in the last email i wrote to christian, its a 4000w fresnal lens spotlight from Arri. how do the mean and initial lumens value help me? do i use one of them in the 'lumens per lamp' value for the ies file

thanks chris


-----Original Message-----
From: radiance-general-bounces at radiance-online.org on behalf of J. David Maino
Sent: Thu 8/3/2006 2:09 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] making my own ies file
 
If you know what kind of lamp you want to use, you can go to philips or ge's website and find the 
lamp there. They should have the mean and initial lumens listed that you can then put into your IES 
file. For the ballast factor, you can use 1, or you can go to a site like advancetransformer.com and 
find a ballast that will work with whatever lamp you've chosen and use that ballast factor (although 
generally you can find a ballast for your lamp that has whatever ballast factor you want, so you 
could probably just set this at whatever you want it to be).

Dave

Chris Foster wrote:
> 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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