[Radiance-general] IES photometry file formats

[R Fritz]

That sounds about right.  I did a quick informal survey of the data  
available from four manufacturers which distribute in the USA.  Here's  
what I found:

   Corelite		linear		  	IES 1995 (one file checked)
   Lightolier		broad line		IES 1995, 2002 (two files checked)
   Lucifer Lighting  	cutting edge	  	IES 2002 (one file checked)
   SIMKAR		inexpensive linear	IES 1986 (426 files)
						IES 1995 (18 files)

SIMKAR seems to have licensed a number of older designs, and this  
probably accounts for the large number of 1986-format files.  The  
newer Lightolier file I checked was 2002 format; the older was 1995.

Randolph

On Dec 7, 2008, at 3:16 AM, Thomas Bleicher wrote:

>
> I think in Real Live(TM) you will find everything.
>
> The good thing about IES is that you can read the essential
> bits from a 95 file with knowledge of the 86 specs. IIRC most
> changes where in the area of required key-words and allowed
> formats. So - if anything - the variations got limited by the later
> versions (not sure about 2002, though).
>
> I haven't seen a lot of 2002 files. One reason is certainly, that
> I stopped looking at IES files. The other is that the manufacturers
> don't re-release their files in a newer version just because
> there is a new spec available. The design of most fittings on
> the market predates most of the specs so it's only a matter of
> when the manufacturers finally got their products measured
> which defines the format of their files.
>
> I think that's why you will find more 1995 files than anything
> else. It was just the right time for the industry to go digital.
>
> In Europe IES gets a bit side lined by Eulumdat and
> the various proprietary plugins for Dialux etc. Although, I
> think that Relux and AGI32 are based on the IES format
> and just package some other information with it.
>
>
> Regards,
> Thomas
>
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