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Lighting Fixture Design Conference London – June 6 th 2013 Graham White why standardisation of performance requirements for LED luminaires is important.

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Presentation on theme: "Lighting Fixture Design Conference London – June 6 th 2013 Graham White why standardisation of performance requirements for LED luminaires is important."— Presentation transcript:

1 Lighting Fixture Design Conference London – June 6 th 2013 Graham White why standardisation of performance requirements for LED luminaires is important. CELMA Guide Apples & Pears

2 Page 2 CELMA then and now 2013 CELMA and ELC Combine to create new organisation To lobby for and support European lighting industry

3 Page 3 Lighting Europe LightingEurope is an industry association representing 31 leading European lighting manufacturers and national lighting associations. The Lighting Industry Association is a founding member LightingEurope members employ over 100,000 people in Europe and represent an annual turnover estimated to exceed 20 billion euros.

4 Page 4 Uptake Of New Technology performance verification performance verification quality awareness quality awareness appropriate standards appropriate standards

5 Page 5 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away

6 Page 6 Compare Performance Claims?

7 Page 7 Compare Performance Claims? efficacy performance technical definitions; product design. LED Die LED Array Optics Control Gear LED Luminaire 90 lm/W90%81 lm/W90%73 lm/W90%66 lm/W 85%77 lm/W50%39 lm/W70%27 lm/W

8 Page 8 Standardised Quality Criteria evaluate performance claims from different manufacturers it is important: to compare a standardised set of quality criteria; that are measured in compliance with the appropriate standard.

9 Page 9 IEC/PAS Performance Requirements recently published IEC/PAS – LED modules for general lighting; IEC/PAS – LED luminaires for general lighting. PAS stands for Public Available Specification Product TypeSafety StandardPerformance Standard LED driversIEC Publication 2006 IEC Publication 2006 LED lampsIEC Edition 1 Publication 2010 IEC 62612/PAS Public Available Specification LED modulesIEC Edition 1 Publication 2008 IEC 62717/PAS Public Available Specification LED luminaires IEC Edition 1 & 2 Publication 2008 IEC 62722/PAS Public Available Specification

10 Page 10 Apples & Pears IEC/PAS Performance Requirements CELMA Guide Apples & Pears manufacturers & certification bodies lighting designers technical engineers policy makers

11 Page 11 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away

12 Page 12 Quality Criteria Initial & Maintained scope initial & maintained claims of LED luminaires; to establish confidence in the product data provided; acceptance or rejection of quality over life is out of the scope! Maintained values are measured at 25% of rated life time up to a max. of hours technical definitions measurement methods limiting values

13 Page 13 Quality Criteria Mentioned In The IEC/PAS 1)rated input power (in W); 2)rated luminous flux (in lm); 3)LED luminaire efficacy (in lm/W); 4)luminous intensity distribution; 5)Correlated Colour Temperature (CCT in K); 6)rated Colour Rendering Index (CRI); 7)rated chromaticity co-ordinate values (initial and maintained); 8)maintained luminous flux Performance claims are always measured at a specific ambient temperature (t q ). Maintained values are measured at 25% of rated life time up to a max. of hours.

14 Page 14 Photometric Code six digit photometric code displays important quality of light parameters initial CRI value of 84 – code 8; initial CCT value of 3000K – code 30; initial spread of chromaticity co-ordinates within a 3-step MacAdam ellipse – code 3; maintained spread of chromaticity co-ordinates within a 5-step MacAdam ellipse – code 5; maintained luminous flux of 91% – code 9. Maintained values are measured at 25% of rated life time up to a max. of hours. 830/359

15 Page 15 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away

16 Page 16 Quality Criteria Over Time > 6000hrs – lifetime claims lumen maintenance; luminaire life

17 Page 17 Lumen Maintenance Claims This is about lumen maintenance of LEDs used in a LED luminaire TM-21: extrapolation 6x measurement. LM-80: 6-10K hrs real measurement. 0

18 Page 18 lumen maintenance (L x B y ) gradual light degradation of LEDs over time. 2 constraints catastrophic failures of individual LEDs are not taken into account; no validated way to translate lumen maintenance of LEDs into lumen maintenance of LED luminaire. lumen maintenance LEDs lumen maintenance LED luminaire; metric seems less appropriate to assess LED luminaires performance! Lumen Maintenance Claims

19 Page 19 Luminaire Life Claims

20 Page 20 Luminaire Life Claims Following IEC recommended lifetime metrics lumen maintenance (L x F y ) gradual light degradation of all relevant components; abrupt failures of individual LEDs & critical components. abrupt failures (L 0 C y ) of the complete luminaire. Specified at: ambient temperature, # burning hours & # switches per day.

21 Page 21 IEC Recommended Lifetime Metrics gradual light degradation abrupt light degradation Example L 70 F 50 life time (hrs) where light output 70% for 50% of the population. Example L 0 C 10 life time (hrs) where light output is 0% for 10% of the population.

22 Page 22 Luminaire Life Claims LED luminaire life (system) lumen maintenance (L x F y ) abrupt failures (L 0 C y ) LxFyLxFy LxCyLxCy X Y

23 Page 23 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away

24 Page 24 Remember not to mix up Apples & Pears Fair comparison of initial performance of different LED luminaires: 1.ask for product specifications measured against an appropriate standard (e.g. IEC/PAS performance requirements). When considering performance over time of a LED luminaire: 1.forget about LM-80/TM-21 lumen maintenance data of LEDs used in a luminaire; 2.look for luminaire life based on lumen maintenance & abrupt failures of the complete LED luminaire or system. Take Away

25 Page 25 Take Away IEC/PAS – LED modules for general lighting; IEC/PAS – LED luminaires for general lighting. FOR SALE via CELMA Guide Apples & Pears: Why standardisation of performance criteria for LED luminaires is important. FOR FREE via


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