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Business Application TeamHorticultural LightingFebruary 2006
Lighting Fixture Design Conference
London – June 6th 2013
Graham White
why standardisation of performance requirementsfor LED luminaires is important.
CELMA Guide Apples & Pears
Page 2
CELMA then and now
2013 CELMA and ELC
Combine to create new organisationTo 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
performanceverification
qualityawareness
appropriatestandards
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.
LEDDie
LED Array Optics Control
GearLED
Luminaire
90 lm/W 90% 81 lm/W 90% 73 lm/W 90% 66 lm/W
85% 77 lm/W 50% 39 lm/W 70% 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 62717 – LED modules for general lighting;• IEC/PAS 62722 – LED luminaires for general lighting.
PAS stands for Public Available Specification
Product Type Safety Standard Performance Standard
LED drivers IEC 61347-2-13Publication 2006
IEC 62384Publication 2006
LED lamps IEC 62560 Edition 1Publication 2010
IEC 62612/PASPublic Available Specification
LED modules IEC 62031 Edition 1Publication 2008
IEC 62717/PASPublic Available Specification
LED luminaires
IEC 60598 Edition 1 & 2Publication 2008
IEC 62722/PASPublic Available Specification
Page 10
Apples & Pears
IEC/PAS Performance Requirements
CELMA Guide Apples & Pears
manufacturers&
certification bodies
lighting designerstechnical engineers
policy makers
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 6.000 hours
technicaldefinitions
measurement methods
limitingvalues
10.000 20.000 30.000 40.000 60.0000
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 (tq).
Maintained values are measured at 25% of rated life time up to a max. of 6.000 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 6.000 hours.
8 3 0 / 3 5 9
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Agenda
1. Introduction
2. Quality criteria initial & maintained
3. Quality criteria over time
4. Take away
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Quality Criteria Over Time
> 6000hrs – lifetime claims• lumen maintenance;• luminaire life.
10.000 20.000 30.000 40.000 60.0000
Page 17
Lumen Maintenance Claims
This is about lumen maintenance of LED’s used in a LED luminaire
10.000 20.000 30.000 40.000 60.000
TM-21: extrapolation 6x measurement . LM-80: 6-10K hrs real measurement.
0
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lumen maintenance (LxBy) • gradual light degradation of LED’s over time.
2 constraints• catastrophic failures of individual LED’s are not taken into account;• no validated way to translate lumen maintenance of LED’s into lumen
maintenance of LED luminaire.
lumen maintenance LED’s ≠ 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 (LxFy) • gradual light degradation of all relevant components;• abrupt failures of individual LED’s & critical components.
abrupt failures (L0Cy) • 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 L70F50
life time (hrs) where light output≥70% for 50% of the population.
Example L0C10
life time (hrs) where light output is 0% for 10% of the population.
Page 22
Luminaire Life Claims
LED luminaire life(system)
lumen maintenance(Lx Fy)
abrupt failures(L0 Cy)
LxFy LxCy
X 70 80 90 0
Y 10 50 10 50 10 50 10 50
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:2. forget about LM-80/TM-21 lumen maintenance data of LED’s used in
a luminaire;3. 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 62717 – LED modules for general lighting;IEC/PAS 62722 – LED luminaires for general lighting.
FOR SALE via http://webstore.iec.ch/
CELMA Guide Apples & Pears: Why standardisation of performance criteria for LED luminaires is important.
FOR FREE via http://www.celma.org/
