Quantifying Luminaire Performance – How Luminaires are Photometered and How That Data is Applied in Lighting Simulations

About this Course

The IES offers Educational Webinars throughout the year, purposefully spanning a broad range of topics and speaker expertise. Quantifying Luminaire Performance was a live webinar, now available as an archived webinar and CEU course.

Description: Luminaire performance needs to be quantified so designers can make informed decisions when selecting products as well as evaluate how those products will contribute to the lighting requirements of their projects. Learning how luminaire photometry is done allows you to better understand their performance data and how it should be applied. Details such as the orientation of the intensity distribution, the location of the photometric center and the luminous shape can all have significant impacts on your lighting simulations. It is critical to know the limits of the data supplied by the manufacturer and what is contained in IES files so that you can obtain the most accurate lighting simulations possible and avoid reworking projects that don’t perform as expected.

Learning Objectives:

By the end of this course learners will be able to...

1. Determine the difference between an integrating sphere and a goniometer.    
2. Learn how photometric data is gathered (ies files) and applied in lighting simulations. 
3. Explore the room for error absolute and relative photometry, as well as near field and far field photometry. 
4. Explore different types of luminous shapes and ies file limitations. 


Quantifying Luminaire Performance
Open to view video.
Open to view video. This video is required for course completion.
10 Questions  |  Unlimited attempts  |  7/10 points to pass
10 Questions  |  Unlimited attempts  |  7/10 points to pass This quiz is required for course completion.
3 Questions
3 Questions This survey is required for course completion.
1.00 CEU credit  |  Certificate available
1.00 CEU credit  |  Certificate available

Mark Jongewaard


Mark Jongewaard started as an illumination engineer at Lighting Technologies, Inc. (LTI) in 1989, later becoming vice president, director of the optics division and part-owner until 2006, when LTI was sold to Musco Sports Lighting. Since the sale, Mark and business partner Ryan Kelley led the formation of LTI Optics (LTIO), which spun off from Musco and continues the optics related business from LTI. This includes the development and sale of Photopia — the most widely used optical design software in the architectural lighting industry — as well as providing optical design services for illumination based (non-imaging) optical systems. He currently is president and principal of LTIO.