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:
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
Page 2 CELMA then and now 2013 CELMA and ELC Combine to create new organisation To lobby for and support European lighting industry
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.
Page 4 Uptake Of New Technology performance verification performance verification quality awareness quality awareness appropriate standards appropriate standards
Page 5 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away
Page 6 Compare Performance Claims?
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
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.
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
Page 11 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away
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
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.
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
Page 15 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away
Page 16 Quality Criteria Over Time > 6000hrs – lifetime claims lumen maintenance; luminaire life
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
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
Page 19 Luminaire Life Claims
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.
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.
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
Page 23 Agenda 1.Introduction 2.Quality criteria initial & maintained 3.Quality criteria over time 4.Take away
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
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