The IES file is a text file used to describe the light output properties of a light fixture. The current IES file format is described in standard LM-63-02. 3dOP Pro reads IES files and uses the data in the file to calculate the amount of light projected onto a surface. A typical IES file is shown below:

IESNA:LM-63-2002
[TEST] LLI 0803-07E
[TESTLAB] LIGHT LABORATORY INC.
[ISSUEDATE] 9/15/03
[MANUFAC] ARCHITECTURAL LANDSCAPE LIGHTING.
[LUMCAT] SL43-150MH-T6-SPT-F
[LUMINAIRE] 12-1/4" DIA X 16-3/4" HT IN-GRADE LUMINAIRE.
[MORE] SEMI-SPECULAR SPOT REFLECTOR.
[MORE] CLEAR FLAT LENS.
[MORE] REV1
[LAMPCAT] CDM150/T6/830 PHILIPS
[BALLAST] 120V 60Hz MH M102 MAGNETIC ADVANCE
[LAMPPOSITION] 0,180
[_LAMPLUM] 14000
TILT=NONE
1 14000 1 24 1 1 1 -.79 0 .35
1 1 175.3
0 90 95 105 115 125 132.5 137.5 142.5 147 151 154.5 157.5 160.5 163 165 167 169 171 173 175 177 179 180
0
0 3 4 6 12 35 153 962 747 816 859 908 1012 1246 1719 2659 4552 7999 14947 29997 65228 133960 221811 230512

3dOP Pro reads Type C IES files because they are the most common for outdoor fixtures. 3dOP Pro displays the IES file in the main window so that all the information is available to the user. Items such as fixture catalog number, type of lamp used during the test used to generate the file, how many watts were used, and many other interesting facts can be checked.

To learn more about the IES file format, visit the Illuminating Engineering Society of North America website at http://www.iesna.org/