Post on 22-Dec-2015
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