The New CIE Standard Test Method for LED Lamps, LED Luminaires and LED

Modules: CIE S 025/E:2015

Tony BergenTechnical Director, Photometric Solutions International

Secretary, CIE Division 2Australian National Representative, CIE Division 2

Contents

• Introduction to the CIE• Need for an International Standard• Development of the Standard• Features of the Standard• Conclusion

Introduction

• The CIE is the International Commission on Illumination

• Abbreviated to CIE from its French form: Commission Internationale de l'Eclairage

• The global peak body on matters relating to the science and art of lighting

• Responsible for creating and maintaining standards and technical reports within the fields such as:– vision and colour;– photometry and radiometry;– lighting and signalling; and– photobiology

Introduction

• Has seven scientific divisions:– Division 1: Vision and Colour;– Division 2: Measurement of Light and Radiation;– Division 3: Interior Environment and Lighting Design;– Division 4: Lighting and Signalling for Transport;– Division 5: Exterior Lighting and Other Applications;– Division 6: Photobiology and Photochemistry;– Division 8: Image Technology

• Each of these divisions has Technical Committees which carry out the scientific work

• CIE also has national committees with voting rights at a general assembly and which support the CIE’s interests within their jurisdiction

Introduction

• CIE experts are on the BIPM’s Consultative Committee on Photometry and Radiometry and provide advice in relation to the SI unit for light:– the Candela.

• CIE has agreements with ISO and IEC: these agreements recognise the CIE as an official standardising body for light and lighting matters.

Introduction

• Foundation work for CIE’s formation started in 1901, but…..

• CIE’s Statutes have operative date of September 1913, which means that…..

• CIE turned 100 two years ago!x100!

Contents

• Introduction to the CIE• Need for an International Standard• Development of the Standard• Features of the Standard• Conclusion

Need for a Standard

• Currently (previously) there are many different test methods used in different areas around the world:– IESNA LM-79-08– EN test methods– IEC 62722, IEC 62612, IEC 62717– JIS C 7801 Am.1: 2012, JIS C 8152-2– Chinese CQC and GB standards– etc.

Need for a Standard

From a presentation by YoshiOhno for the IEA 4E SSL Annex

Need for a Standard

AIMA unified global standard for

harmonisation of testing of LEDs and SSL products

Need for a Standard

From a presentation by YoshiOhno for the IEA 4E SSL Annex

Contents

• Introduction to the CIE• Need for an International Standard• Development of the Standard• Features of the Standard• Conclusion

Development of the Standard

• A CIE Division 2 Technical Committee worked on the standard:– TC2-71: CIE Standard on Test Methods for

LED Lamps, luminaires and modules

• The TC has 37 members from 16 countries in 5 continents

• Working closely with CEN-TC169-WG7• Draft published in September 2014• Final version published in March 2015

Development of the Standard

• Has had significant difficulties establishing a consensus amongst the stakeholders:– Public testing labs;– LED/Lighting manufacturers;– Test equipment manufacturers;– Regulatory bodies;– NMIs;– etc…

Development of the Standard

• Also needed a consensus with the CEN-TC169-WG7 working group, whom we were partnering in the development– (It is technically identical to the CEN standard

EN13032-4, which will be released soon)

Development of the Standard

• There have been some robust discussions and disagreements

• Difficulties were largely overcome so that we could move forward to begin the publication phase

Contents

• Introduction to the CIE• Need for an International Standard• Development of the Standard• Features of the Standard• Conclusion

Features of the Standard

• The draft Standard defines standard test conditions and requirements for equipment

• It covers electric, photometric and spectral/colorimetric properties

• It covers LED lamps, LED luminaires and LED modules

• Testing should ideally be performed according to the standard test conditions

Features of the Standard

• Some of the standard test conditions have tolerances to take into account practical laboratory situations

• Example 1:– The ambient test temperature should be 25°C– In practice it can be in the range 25 ± 1.2 °C

(including uncertainty in measurement of temperature)

• Example 2:– The air should be still– In practice it is allowed to be up to 0.25 m/s

(including uncertainty in measurement of air speed)

Features of the Standard

• If the standard test conditions are not met, then a correction must be made

• For example:– A goniophotometric test is made with ambient

temperature of 23 ± 0.5 °C– This is outside the range 25 ± 1.2 °C– An additional test must be made, eg: with the

device in a temperature controlled chamber, to correct the measured value to what it would be if the test were performed at 25°C

Features of the Standard

• The equipment and electrical supply also have tolerances

• Examples:– The test voltage shall be measured at the supply

terminals of the DUT, not at the output terminals of the power supply

– Tolerance interval: ± 0.4 % for RMS AC voltage; 0.2 % for DC voltage.

– The total harmonic content of the voltage waveform shall not exceed 1.5 % of the fundamental (except if PF > 0.9, then it shall be less than 3 %).

Features of the Standard

• The standard covers measurement using:– Integrating spheres;– Goniophotometers;

• Near-field gonio allowed if validated against a far field gonio• The DUT can be tested in an orientation other than its designed burning

position, provided corrections are made

– Luminance meters, including ILMDs;– Spectroradiometers.

Features of the Standard

• Measurements must be traceable– Equipment must be properly calibrated– Traceability chain must be maintained back to a

national laboratory (National Measurement Institute)

• All test reports must contain a statement of uncertainty of measurement– The standard gives a guide for how to make an

uncertainty budget

• The Standard really just focuses on quality and compatibility of measurement, and not product performance as such.

What it covers

• The draft Standard covers:– Environmental conditions (air temperature, air movement,

stray light);– Electrical supply and quality;– Measurement instruments (photometric & electrical);– Lamp mounting / operating position;– Lamp Operating Conditions;– Lamp stabilisation;– Initial total luminous flux;– Centre beam and beam angles;– Partial luminous flux (useful lumens);– Test distance for far-field goniophotometry;– Colour and chromaticity measurements.

What it doesn’t cover

• The draft Standard does not cover or partially covers:– Dimmable, internal feedback, adjustable colour, adjustable white, multicolour;– Maintained luminous flux;– Omni-directional assessment;– Maintained colour measurements;– Harmonics & EMC;– Start time / activation time;– Switch withstand;– Lamp Life;– Temperature cycling shock;– Endurance;– Photobiological hazards;– Flicker;– Dimmer compatibility.

• Note: Many of these are already covered satisfactorily in other Standards.

Contents

• Introduction to the CIE• Need for an International Standard• Development of the Standard• Features of the Standard• Conclusion

Conclusions

• The CIE is the world’s premier scientific organisation responsible for matters relating to light and lighting

• Celebrated its official centenary in 2013• CIE has developed an International Standard

Test Method for LED Lamps, LED Luminaires and LED Modules

• This will enable accurate and repeatable measurements for harmonisation and intercomparison around the globe

Thank youfor your kind attention

Tony BergenTechnical Director

Photometric Solutions InternationalFactory Two, 21-29 Railway AvenueHuntingdale, Vic, 3166, AustraliaTel: +61 3 9568 1879Fax: +61 3 9568 4667Email: tonyb@photometricsolutions.comWeb: www.photometricsolutions.com