[Radiance-general] making my own ies file

[J. David Maino]

Chris,

Say you had an initial lumen value of 15,000lm for the lamp you've chosen. All you would have to do 
would be replace [lumens per lamp] with 15000. The mean lumens will be a lower value than the 
intital lumens. If you are using a light loss factor in your calculations, you should use one of the 
following combinations:

a) use the initial lumens in your IES file and use an appropriate value for the lamp lumen 
depreciation in your light loss factor (the lamp lumen depreciation value will depend on the lamp 
chosen)

b) use the mean lumens in your IES file and use a value of 1 for the lamp lumen depreciation in your 
light loss factor, since the mean lumens already take the lamp lumen depreciation into account.

Hope that helps!
Dave

Chris Foster wrote:
> 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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