Post on 01-Jul-2015
Next Generation
Luminaires
What NGL Tells Us About the State
of the Art in LED LuminairesMarch 19, 2014
Craig Bernecker, PhD, FIESNA, LC; The
Lighting Education Institute
Ruth Taylor, IES; Pacific Northwest
National Laboratory
Dan Blitzer, LC; The Practical Lighting
Workshop
Competition Partners
International Association of Lighting Designers IALD
Partnerships to link energy efficiency & lighting quality
What We’ll Cover Today
• Why NGL?
• How NGL works
• What you can learn from what we have done
• What we have seen in the last 5 years
• What the entries and winners have shown us
• How NGL can help in the future
Why NGL?
What Designers/Specifiers need to know.
• Does it perform as expected for the intended location
or function?
• Is it bright enough?
• Is the color right?
• How easy or difficult was installation?
• Is it serviceable?
• How will it perform over time?
What Makes NGL Different?
• Inclusive rather than exclusive
• Performance evaluation with extensive
documentation
– More time and resources than most
designers can afford
• Judged in characteristic applications
and “hands on”
• Diverse, professional judging panel
How NGL Works
Judging is the Key
• Approach
• Criteria
• Installations
• Evaluations
• Selecting Winners
Judging Approach
• Organized by application
• Product Evaluation
• Installed and lighted
• Table top (2nd fixture)
• Documentation
• Process
• Independent judgment
• Preliminary scoring
• Discussion and decision
• Post judging analysis &
verification
Judging Criteria
In-person evaluation:
• Color
• Illuminance
• Light distribution
• Glare control
• Serviceability
• Value
• Aesthetic appearance
• Bonus (flexibility, innovation,
dimming)
Documentation analysis:
• Luminaire Efficacy
• Lumen maintenance
Outdoor Criteria –
Application Templates
Pole spacing 120’Light Loss Factor
0.88 * lumen maintenance (LLD) at
25,000 hoursMaintained minimum horizontal illuminance
0.2 fc (basic) or 0.5 fc (enhanced security)
Max/min uniformity
20(basic) or 15 (enhanced)
Maintained minimum vertical illuminance
0.1 fc (basic) or 0.25 fc (enhanced security)
Pole spacing 150’Light Loss Factor
0.88 * lumen maintenance (LLD) at
25,000 hours
Street Criteria See RP-8-00, Table 3Average luminance (maintained)
0.5 cd/m2
Avg/min uniformity
6.0
Max/min uniformity
10.0
Veiling luminance ratio
0.4
Sidewalk Criteria
See RP-8-00, Table 7
Average Horizontal Illuminance (EHave)
4.0 lux
Minimum Vertical Illuminance (EVmin) at 4.9 ft above sidewalk
1.0 lux
EHave/ EHmin 4.0
Allows ‘Apples to
Apples’ Comparison
Scoring
• Each category is evaluated in terms of the application
for which the product is intended.
– 0 = Not acceptable
– 1 = Acceptable
– 2 = Good
– 3 = Very good
– 4 = Outstanding
Products scoring a „0‟ in categories 1-7 are suspect for “specifiability”.
Pre-scored Criteria –
Efficacy & Lumen Maintenance
Efficacy Scoring Rationale
• Below requirement: 0
• At requirement to +10%: 1
• +11% to +40%: 2
• +41% to +75% 3
• Over +75% 4
Lumen Maintenance Scoring Rationale
• Meets minimum 70% LM at 50,000 hours 0
• 70% < LM < 80% 1
• 80% < LM < 88% 2
• 85% < LM < 90% 3
• LM > 95% 4
Selecting Winners
• Recognized means „suitable for specification‟
• Best in Class must stand out overall and in category
– Relatively few products meet this dual standard
Learn From What We Have Done
• Install samples in intended applications
• Take things apart
• Review documentation
– Get the facts
– Check the facts
– Know what you‟re looking at and why
Outdoor Judging Setup
17
Indoor Judging Setup
Seeing is Believing
Take Things Apart
• How much time to install?
• What can be replaced?
• Can it be serviced?
Outdoor Installations –
Time is the Key
Controls – What a Mess!
Documentation –
What You Need to Know
• Will it perform as claimed?
• Will it perform as expected for its intended us?
• Will it perform as claimed/expected over time?
• Will it dim as claimed/expected?
• Will contractors have issues with installation?
• Will it have color consistency issues across products and
over time?
• At end-of-life, will it be disposed of in a responsible
manner?
• How does its performance compare with other products
What NGL Requires
General
• Luminaire specification sheet
• Product photos/marketing materials
LED Lighting Facts documentation
• LM-79 test report (including sphere data)
• LM-80 test report on LED package/module/array
• LED package/module/array specification sheet
• ISTMT on submitted model
• ENERGY STAR TM-21 Calculation
Other
• Installation/serviceability statement
• Driver specification sheet/dimming interface spec sheet
• Product warranty/end-of-life statement
Understanding Lumen
Maintenance Projections
• Lumen maintenance % is not a lifetime metric
• It is % light output after a specified time vs. initial output
• Measures source only - in thermal environment of
luminaire
• In contrast, lifetime metric includes all system
components (electronics, optics, thermal management,
housing etc.)
• No industry standard for lifetime is yet available
SSL Testing Methods
Luminaire
Electronics
LED packages
Thermal Management
LM-82
LM-79
AC LEDs WG
TM-28
TM-26
Waveform WG
Remote Phosphor WG
LED Reliability WG
LM-84
LM-85 LM-80 TM-21
Optics/Phosphors
Color Stability WG
• Approved method describing procedures and precautions in performing reproducible measurements of LEDs:
– Integrating Sphere
– Goniophotometer
IES LM-79-08: Electrical and Photometric
Measurements of Solid-State Lighting Products
Understanding LM-79
Integrating
Sphere
Goniophotometer
LM-79 Scope
• Applies to LED-based products incorporating control electronics and heat sinks:– Products requiring only line voltage or DC power supply
– Includes complete LED luminaires and
– Integrated LED sources (LED chips with heat sinks)
• Does not cover – LED products requiring external operating circuits or heat
sinks (bare LED chips, pkgs, and modules)
– Fixtures designed for LED products but sold without a light source
Integrating Sphere
Photometric Report
• Total Luminous Flux
• Spectral Power
Distribution
• Chromaticity
Coordinates
• CCT
• CRI
Goniophotometry
• Luminous Intensity
Distribution
• Total Luminous Flux
• Zonal Lumen Sums
• IES Format File (LM-63)
LM-80 Documents
Understanding ISTMT
Understanding ISTMT
TM-21 Calculations
Drive current of chip for luminaire ISTMT must be less than drive current of chip for LM80 test.
TM-21 Calculations
Enter highest measured LED temp from ISTMT.
Enter projected hours and read resulting lumen maintenance.
TM-21 Calculations
Enter LM-80 data from chip manufacturer
2014 Standards Workshop Update
Held March 17-18, 2014 – Destin, FL
Working groups formed to create:
• Educational guide on using SSL standards and testing
reports
• Electronic file format for testing data
• Testing method for color tuning products
What We’ve Seen
Lots of Products
2013 All
Intents 258 1377
Judged 167 726
% of intents judged 65% 53%
Awards 59 257
% of judged awarded 35% 35%
Former Winners –
Where are They Now?
YearCompany
Exists?
% Companies
Exist
Model Exists?
% Models Exist
Model has higher
efficacy?
% With Higher Efficacy
AWARDED Products
Total
2008 21 100% 19 90% 13 62% 21
2009 43 93% 38 83% 22 48% 46
2010 39 93% 36 86% 20 48% 42
Indoor Category Trends
High energy impact categories
• Troffers
• Downlights
• Linear Pendants
Low energy impact categories
• Accent
• Decorative
• Wall
Percent of Entries and Winners
Example Category Progression
Downlights Year
Efficacy Requirement
(lm/W)
Avg. Efficacy Winners(lm/W
) # 0f Winners2008 35 51 62009 35 54 62010 35 49 92012 45 56 8
2013 50 NA 0Accent
2008 no min 29 62009 35 38 52010 35 40 11
2012 35 52 92013 40 59 7
General Illumination2008 no min 72 12009 35 52 4
2010 35 48 2(troffers show up) 2012 60 87 12
2013 80 93 1
Efficacy Trends
Outdoor
Products
Indoor
Products
Efficacy Trends
2008 49.5 lm/W
2009 59.4 lm/W
2010 53.5 lm/W
2012 74.8 lm/W
2013 87.2 lm/W
High Energy Impact
Categories:
• Downlights
• Troffers
• Street/area luminaires
CRI Trends
What NGL Has Shown Us
Speaking Up Does Make a Difference
• Documentation – what we need and why
• Serviceability – it will need to be serviced EVENTUALLY
• End of Life Policies – they do matter
• Color matching across products – certain applications
demand it
• Color shift – does anyone know?
• GLARE GLARE GLARE
Interesting Approaches Are Possible
Glare vs. Efficacy –
the Battle Continues
• Efficacies continue to increase
• Most frequent negative judging comment is typically
related to glare
Seeing What’s
on the Horizon
• 2012 – Troffers - we‟ve arrived! (8 recognized products)
• 2013 - Downlights - ho-hum (0 recognized)
• 2013 - Color tuning products, on the horizon
Using NGL Materials
www.ngldc.org
Notes from the
judges are key.
2013 Winners
Outdoor (December 2013)
• 26 awarded products of 68 judged
• 6 Best in Class
Indoor (March 2013)
• 33 awarded products of 99 judged
• 3 Best in Class
2014 Indoor Competition Opens March 31st.
2013 Indoor Best in Class
"XLE-3-10 Xpress"
by Digital Lumens
"Trac-Master T254L
Cylindra" by Juno
Lighting Group
"W Series LED" by Acuity
Brands/Lithonia Lighting
2013 Outdoor Best in Class
‘PL2 Series Bollard’
by Juno Lighting
Group
‘NXT-S’™
by LED Roadway
Lighting‘Finia’ by Juno Lighting Group
‘McGraw-Edison Top Tier’™
by Cooper Lighting by Eaton
‘CPY250’ by Cree
‘LP ICON LED’
by Louis Poulsen Lighting
Thanks
Questions?
Craig Bernecker craig.bernecker@gmail.com
Ruth Taylor ruth.taylor@pnnl.gov
Dan Blitzer dlblitzer@aol.com