1. What is LM79 & LM80?
Why are they important?
Dr Gareth Jones
CEO LUX-TSI &
TheDoctor for LUX Magazine

2. Why do we need Standards for LEDs?
Market is flooded with LEDs claiming to replace conventional lamps and luminaires
Some achieve this, but many fall far short
LED lamps claiming to replace a 100W lamp may  typically deliver less light than a 40W lamp! 
Limited market surveillance to identify these cases, and a lack of standards means they cannot easily act 
This is damaging consumer perception of LEDs in general 
Negative impact on rate of LED acceptance
Avoid same bad feeling as early CFLs!

3. TheDoctor’s Mantra
I believe that the Americans have, in LM80 and LM79, developed effective and practical standards for testing of LED chip, lamp and luminaires.
These have been widely adopted in the US as de facto standards.
I believe European manufacturers should, in the absence of European standards with wide acceptance, adopt LM79 and LM80 until formal standards come into force in europe.

4. Disclaimer - European Standards
IEC/CEN is working on a revision to EN but it is not clear when the new revision EN13032-x will come into force.
IESNA LM-79 and LM-80 have been in force since and are rapidly being adopted around the world for LED.
It is not that EN13032 is not good – it is that EN does not cover LEDs yet and in the absence of this we advocate we should use LM-79-08

5. Accreditation is Important
Ensures a consistent minimum level of competence - independently audited and verified
Traceability of calibration so we avoid the “Chinese Lumen” problem
Round Robin Testing between Labs is Encouraged and is Important to ensure labs achieve consistency for Global Markets
Standards are Important
Ensure that all labs and manufacturers are given guidance on best practise.

6. Would you use a Cowboy builder?
I doubt it.
You would look for some form of accreditation

7. What to look for in Lighting Photometric Test Labs
Key global requirement for photometry & colorimetry is that testing laboratories have proven competence through ISO17025 audited by an ILAC affiliated organisations.
In the UK, this is UKAS.

8. Worldwide Lighting Test Laboratory Accreditation
IECEE CB Scheme for IEC Safety Approvals (iecee.org)
ILAC-MRA Bodies for Competence in Testing with ISO (UK – ukas.com)
UL DAP Programme for submission of test reports against UL Standards ( ul.com)
There are others but these are the main ones.

9. Types of Testing Performance Safety Form(Zhaga) Labelling Electrical
Thermography
EMC Emission & Immunity
Photometry
Photobiological
Lumen Maintenance
Endurance
Environmental
Mechanical

10. Types of Testing Performance Safety Form(Zhaga) Labelling Electrical
Thermography
EMC Emission & Immunity
Photometry
Photobiological
Lumen Maintenance
Endurance
Environmental
Mechanical

11. LM-79 “Electrical and Photometric Measurements of Solid-State Lighting Products”
IESNA Approved method describing procedures and precautions in performing reproducible measurements of SSL Products for Illumination Purposes:
Total Luminous Flux (lumens)
Luminaire Efficacy (lm/W)
Colour (Chromaticity, CCT, CRI)
Intensity Distribution
Referenced to CIE, ANSI & IESNA

12. Lamps & Luminaires

13. Key Stipulations Ultra stable Temperature +/- 1C
Voltage regulation < +/-0.2%
Thermal Stabilisation < 0.5% over 30 minutes
Test in Orientation of Use
Type C Goniometry only
Test Report minimum standard
Spectroradimetry preferred (photometer much less preferred but accepted if the spectral mismatch correction is provided – see TheDoctor – The Wheat & the Chaff)

14. Essential Items
Stable Power Source – Ensuring all changes in performance are due to the product.
Calibrated Power Meter – To measure the true power and calculate the power factor and harmonics
Calibrated Temperature Monitor 25C +/- 1C !
Calibrated Air Flow Meter – No draughts!

15. Integrated Flux Integrating Sphere Spectroradiometer
(or corrected Photometer)
Calibration Lamps

16. Measure Spectral Flux with Wavelength
Compute
Total Integrated Flux (Lumens -Lm)
Colour Rendering Index (CRI) R1-R14
Correlated Colour Temperature (CCT)
White Light Appearance – Tint (Duv)
Chromaticity (x,y u’,v’)
Luminous Efficacy (Lm / W)

17. Goniometric Intensity
Type B Near-Field Imaging (not LM79 compliant)
Type C Far-Field Intensity
(LM79 Compliant)

18. Measure Intensity Distribution with Angle
LED Without Optics
LED With Optics

19. Measure Intensity with Angle
Output key Plots and File Depending on Preference
IES Files
LDT Files
Polar Plots
Cone Diagrams
Isolux
IsoCandela
Glare, UGR
Roadway Utilisation
Zone Summaries

20. Thermal Stabilization
ESSENTIAL FOR ALL LED MEASUREMENTS – KEY ISSUE
Ensure normal convection of air flow as to not affect the LED Temperature.
The effect of Temperature on LED performance is a key issue
Can give rise to errors as much as 30% in Luminous Flux
Can lead to big difference in CCT for colour mixed LEDs
08/06/2011

21. Referenced to CIE, ANSI, LM79 standards
LM-80 “Approved method for measuring lumen depreciation of LED light sources”
“Light Sources” includes LED packages, arrays and modules.
Does not cover measurement of lamps and luminaires.
Referenced to CIE, ANSI, LM79 standards

22. Referenced to CIE, ANSI & IESNA
LM-80 “Approved method for measuring lumen depreciation of LED light sources”
Provides guidance for measuring lumen maintenance
Requires testing for at least 6000 hours at 3 different junction temperatures
Does not define or provide methods for estimation of life.
Requires TM-21 as the analysis method for determining the lumen maintenance value from the measurements.
Referenced to CIE, ANSI & IESNA

23. LM-80 - Useful
Ensures lifetime of the LED is tested at component level – avoid the cost of testing of the final product assembly – this is a key design consideration!
Specifies 3 realistic temperatures for the testing – 2 are fixed and one can be determined by the manufacturer
Refers to LM79 for the basis of the testing of the photometric output of the sources - ensuring good practise (Did you spot the discrepancy?)
Is being used to prevent expensive hour testing at the luminaire/lamp level
Is already referenced in UK schemes like ECA guidance

24. New Standard – LM82-12
Characterization of LED Light Engines and LED Lamps for Electrical and Photometric Properties as a Function of Temperature.
Excludes luminaires.

25. Some emerging Standards
IES LM-XX-12  Measuring Lumen Maintenance of LED Lamps, Light Engines and Luminaires
IES LM-XX-??  LED Package Reliability Testing – Qual/Overstress/Failure Specification & standardise on LED test specification for manufacturers
CIE TC2-71 Standard on Test Methods for LED Lamps, Luminaires and Modules
CIE TC 2-74 Gonio-spectroradiometry of Optical Radiation Sources
& others EN13032-??

26. Quick Summary
Accreditation of test labs is important to ensure known minimum standards of competence, traceability and comparability around the world.
LM-79 and LM-80 good reference for test labs and manufacturers. Also, appearing in some Government incentive schemes.
Looking forward to EN13032 and other EN stds.
New standards from IESNA and CIE emerging fast to provide guidance on good practise for LED lighting. Adopt in the absence of better guidance.

27. Meet us at NEC Birmingham for UL/LUX-TSI Roadshow on LED Lighting Standards and Regulation 1-day free event 12th June (bit.ly/N2O74V) euroLED.org.uk 13th & 14th June Stand LED 218

28. UL/LUX-TSI Roadshow on LED Lighting Standards and Regulation
1-day free event th June (bit.ly/N2O74V)
10: :15 Welcome and Introduction – SSL Global Trend Roberto Inclinati – Business Development Manager, UL
10:15- 10:45 UL & IEC Standard update Albert van der Veen – Project Engineer, UL
10: :15 UL8750 for Decorative and Architectural LED Lighting Products to Access to the U.S Market with references to IEC requirements Albert van der Veen – Project Engineer, UL
11: Coffee Break
11: :30 Energy Star & Lighting Facts- Legislation and Requirement for North America Gareth Jones – LUX-TSI Ltd.
12: Buffet Lunch
13: :30 ErP - Legislation and Requirements for Europe Gareth Jones – LUX-TSI Ltd.
Zhaga - Book 2 & Book 3 Luca Tibaldini – Engineering Manager