2013

Table Of Contents
Example of Ellipsoidal distribution
In this example, the points in the negative Z direction are the same distance
from the origin as the corresponding points in the positive Z direction, so the
same amount of light shines upward and downward. No point has a very large
X or Y component, either positive or negative, so less light is cast laterally
from the light source.
IES Standard File Format
IES standard file formats can be created and modified.
You can create a photometric data file in the IES format using the IES
LM-63-1991 standard file format for photometric data. (IES stands for
Illuminating Engineering Society.) However, only the information relevant
to AutoCAD is described here. For a complete description of the IES standard
file format, see IES Standard File Format for Electronic Transfer of Photometric
724 | Chapter 13 Render Drawings