May 30, 2022
LM-85 is an Illuminating Engineering Society (IES) approved method for the Electrical and Photometric Measurements of High Power LEDs. The…
December 29, 2020
Jeff Hulett, Vektrex CTO, discussed Current Source Induced LED Photometric Measurement Variations at CORM...
March 16, 2017
In Jeff Hulett’s latest article, published in Pennwell’s LEDs Magazine, he identifies the source of wide-spread measurement errors in the LED industry, details measurement methods that can help reduce these errors, and provides guidelines to ensure that LEDs are not undervalued.
March 8, 2017
In this webinar, Jeff Hulett discusses factors that must be controlled for optimal repeatability and provides examples of what to look for and what to avoid in your measurement system.
January 16, 2017
In this webinar, Jeff Hulett discusses the three LM-85 measurement methods and hones in on the method that provides the most accurate measurements: Continuous Pulse.
October 26, 2016
Jeff Hulett presents techniques to identify, quantify, and minimize errors when using continuous pulse method.
May 4, 2016
Typical LED measurement systems use source/measure instruments delivering DC or pulsed current. In many of these systems junction temperature is…