[Radiance-general] Photometric data for car headlights

[Richard Clibborn]

Hi all.  I have a situation where I want to analyse typical spill lighting from 
cars on a road.  I will be comparing the spill light and potential glare from 
car headlights before and after proposed road changes.

The trouble is that photometric data for car headlights does not appear to be 
as readily available as commercial interior/exterior lighting files are.  The 
only data I have so far is the sample .rad files for Highbeam and Lowbeam 
lights as used in the road lighting examples in "Rendering with Radiance".  As 
I will be doing analysis in Radiance and other packages, I really need IES 
files for typical headlights

So, my question is, does anyone have any photometric data (IES files) for car 
headlights of any sort?  Or, if not, does anyone have any suggestions for where 
I might be able to find some?  I am primarily concerned with the standard 
headlights (ie. dipped beam, not high beam).

Any help would be greatly appreciated.

Thanks,
Richard