IES Files

Jan. 4, 2019

What is an IES file?

If you are in the Lighting industry, you’ve heard of IES files. But do you know what they are and why you need them?

IES files refer to data sets built in accordance with ANSI/IESNA LM-63-2002. This is a global standard which defines the format for photometric data file storage, retrieval and transfers. In other words, the photometric data produced when you test and measure your lighting products needs to be presented in an IES file format. 

How are IES files used?

IES formatted photometric data files help lighting professionals select products and options that are most appropriate for their requirements. The IES files also help developers analyze their product performance, and help marketing to generate product collateral. The files are used in applications like Photometric ToolBox, Photometrics Pro, IESViewer, Visual, Photometric Viewer, Economic Viewer and other commercially available software.

How do you get IES files?

That depends on how you test and measure your lighting products. The most common method is with a goniophotometer or gonio spectrometer. At Labsphere, we've made it easy to collect the photometric data and present it in approved IES file format by using our Benchtop Goniospectrometer and Type C Moving Mirror and moving detector goniophotometers.  

Can I get Intensity Distribution Plots from an IES File?

In addition to complete data analysis, lamp and luminares characteristics, and reports, the data can be viewed in 2D and 3D plots, Polar Graphs, Isocandela, and CU Graphs. For example, above is an axial display of a solid state PAR lamp.