how are we doing? what ngl tells us about the performance and quality of led luminaires - presented...
TRANSCRIPT
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Melanie Taylor, IALD, LEED BD+C; WSP Lighting
Design
Dan Blitzer, LC; The Practical Lighting Workshop
Ruth Taylor, IES; Pacific Northwest National
Laboratory
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Partnerships link energy efficiency & lighting quality
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Understanding NGL
Judging criteria and the lighting design practice -observation and data
Key findings from the most recent competitions
Trends and outliers in NGL results over time
What’s ahead for NGL: sharper focus and in-depth evaluation
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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
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Approach
Criteria
Installations
Evaluations
Selecting Winners
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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
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9
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• NGL Minimum efficacy requirements typically match (higher in 2015) DLC
DLC
• Products are submitted through LF to enter the competition
LED Lighting
Facts
• Documentation is reviewed by LF and NGL technical staff
LF/NGL Doc
Review
• Judges evaluate products in-situ
NGL In-Person Judging
• Additional testing or review is conducted as needed before awards are announced
NGL Awards
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www.ngldc.org
Notes from the
judges are key.
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Criteria – what and why
Installations in intended applications
Deconstruction – understanding
serviceability
Documentation
Get the facts
Check the facts
Know what you’re looking at and why
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In-person evaluation:
Color
Illuminance
Light distribution
Glare control
Serviceability
Controllability
Value
Aesthetic appearance
Bonus points
Documentation analysis:
• Luminaire Efficacy
• Lumen maintenance
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Evaluation is based on visual evaluation of the color appearance,
consistency, and rendering of the installed luminaire.
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Color Rendering versus lighting output
Color Rendering of specific colors
Spectrum of LEDs can be modulated, plant
growth lighting is an example.
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Color temperature a edge of beam
Color temperature between nodes in linear fixtures, grazers in particular
Move back to warm, 2700K, now that we can use an efficient source with that color temp
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Horizontal and/or vertical illuminance for the
application must be appropriate according to
accepted lighting practice.
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Somewhat related to efficacy but more
subjective
Appropriate for the application
Narrow, dim spot of light may be
exactly appropriate for a bar counter
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Evaluation based on visual evaluation of the uniformity and
contrast provided by the luminaire.
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Striations and shadows
Outer beam of light
Sharp cut-off at edge of beam
Appropriate for the application
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Luminaire brightness is evaluated in
conditions as similar as possible to
the intended application to assess
discomfort glare and contrast.
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Glare bombs!
Multi-module vs single module
Quality is revealed when looking at
glare control
Does affect light output
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Entries must demonstrate attention to specifier and user concerns about follow-
on service and replacement in the event of component failure and replacement
of LED modules at end of life.
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Must be able to describe replacement of modules and drivers to clients
Is it accessible in place?
Are instructions clear?
May want to replace to higher efficacy/similar output module in the future
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Purchase price is compared to other traditional
sources for the intended application.
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Is the move to LED worth the initial cost?
Costs can vary dramatically for very
similar fixtures.
Make sure options chosen match the
application, each option affects cost.
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Evaluation is based on subjective
evaluation of the aesthetic appearance
and style of the installed luminaire.
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Quality and construction
Leveraging LED module advantages –
small size, point source, controllable
Appropriate for application
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Dimmability – color constancy, dimming range, dimming smoothness, start
conditions, and other criteria
Look at entire system
Range of dimming
Flicker, color shift, jumping, short dimming range
Multiple control options
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Innovation - taking advantage of the unique LED characteristics
Fixture designed for LEDs
Leverage LED module characteristics
Does not need to be 2’ x 4’
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LEDS are changing our Industry
Quality has improved quickly
LED efficacy will help us meet ambitious energy goals
More innovation to come
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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?
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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 (DMX, how to address)• Product warranty/end-of-life statement
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LED Spec Sheet
LM-80 Report
ISTMT Report
TM-21 Calculation
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Lumen Maintenance %
• Not a lifetime metric
• % light output after a
specified time vs. initial
output
• Measures source only - in
thermal environment of
luminaire
Lifetime Metric
• Includes all system
components
– Electronics
– Optics
– Thermal management
– Housing
No industry standard for lifetime is yet available.
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A lot of interest in NGL!
Improving efficacy is real
Light output is increasing . . . Usefulness too.
Color may not be the concern it was
Color quality for outdoor can improve further
Serviceability remains an issue – focus for 2015
Controllability remains an issue – focus for 2015
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2014 All
Intents 267 1,644
Judged 153 879
% of intents judged 57% 53%
Awards 61 318
% of judged awarded 40% 36%
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ALL
PR
OD
UC
TS:
IND
OO
R
Year AVG lm/W AVG CRI AVG lm
2008 38 83 980
2009 45 81 1,292
2010 49 81 1,651
2012 59 81 2,856
2013 70 82 3,928
2014 79 83 5,405
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ALL
PR
OD
UC
TS:
OU
TDO
OR
Year AVG lm/W AVG CRI AVG lm
2008 45 73 4,011
2009 48 74 3,595
2010 60 73 4,647
2012 68 75 6,647
2013 100 76 11,375
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All Entries
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AWARDED
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Outdoor Indoor
All
Awarded
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Outdoor Indoor
All
Awarded
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Outdoor Indoor
All
Awarded
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Lm/W CRI
2014 All BIC/Rec All BIC/Rec
Downlights 71 71 83 82
Troffers 100 96 82 85
Industrial 101 100 81 81
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0%
20%
40%
60%
80%
100%
2008 2009 2010 2012 2013 2014
High energy impact categories
• Troffers
• Downlights
• Linear Pendants
Low energy impact categories
• Accent
• Decorative
• Wall
Percent of Entries and Winners
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YearEfficacy Requirement (lm/W)
Avg. Efficacy Winners (lm/W) # 0f Winners
Do
wn
lig
hts
2008 35 46 62009 35 54 62010 35 49 92012 45 56 92013 50 NA 02014 55 71 12
Acc
en
t
2008 no min 29 62009 35 38 52010 35 40 112012 35 53 92013 40 59 72014 45 63 9
Tro
ffer/
Uti
lity 2008 no min 72 1
2009 35 52 12010 35 48 12012 60 87 102013 80 93 132014 85 97 8
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Higher efficacy requirements
Limited categories
Digital controls
More in-depth serviceability evaluation
Main performance criteria stays the same
Focus on color tuning (indoor) and pedestrian scale
(outdoor)
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Push the envelope – higher efficacy minimums
Focus on key issues
Controls
Serviceability
Fewer entries for more focused evaluations
More realistic installations for more accurate evaluations
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LIGHTFAIR International 2015 – DOE SSL Booth
LIGHTFAIR NGL Presentation - Monday May 4, 2-5 pm
Time and Money: Installation and Serviceability of LED
Luminaires
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