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What is LM-79?

What is LM-79?

Oct 16, 2019

LM-79 is the Illuminating Engineering Society of North America (IESNA) approved method for the Electrical and Photometric Measurements of Solid-State Lighting (SSL). It measures an LED luminaire or integral lamp as a whole system according to a standard process using specified equipment.

Who can perform testing?
LM-79-08 testing should be performed by EPA-Recognized Laboratories for the category of product tested. Only reports from recognized laboratories are relevant. This standard is used for Department Of Energy (DOE) ENERGY STAR program qualification and lighting facts advocate program. All GREEN CREATIVE product testing are performed according to LM-79-08 in an EPA recognized laboratory and reports are available upon request.

What does it provide?
The testing report issued according to a standard format will provide
– Total Luminous Flux
– Luminous Intensity Distribution
– Electrical Power Characteristics
– Luminous Efficacy (calculated)
– Color Characteristics (CRI, CCT…)

IN SITU TEMPERATURE MEASUREMENT TEST (ISTMT)

It is the measure of the LED source case temperature within the LED system (luminaire or lamp). Put simply, it is the temperature of the LED within the luminaire. The measurement has to be performed according to the temperature measurement point (TMP) indicated by the LED package manufacturer.

Who can perform testing?
OSHA approved NRTLs or DOE CALiPER Recognized or UL Data Acceptance Program laboratories. It can be performed at the same time as LM-79-08. All GREEN CREATIVE products go through ISTMT in an EPA recognized laboratory and reports are available upon request.

What does it provide?
Once ISTMT is known, we check if the temperature within the luminaire is within the temperature of the LM-80-08 LED source report. It is then the basis for lifetime interpolation either based on TM-21-11 or other method.