Photometric data for car headlights

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.


Did you ever find any IES files for headlamps?

Dave Brown, P.E.


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