Performance Specification for
LED Roadway Lighting ‐ DRAFT
Revision: B3
Posted Online for Public Comment
April 4, 2011
Public Comment Period End Date
May 2, 2011
Email to MSSLC@SEATTLE.GOV
Please use Track Changes and Comments in Microsoft Word
Draft Prepared by:
Pacific Northwest National Laboratory
c/o Seattle City Light
700 Fifth Avenue, Suite 3200 | P.O. Box 34023
Seattle, WA 98124‐4023 | 206‐733‐9945
MSSLC@Seattle.gov | www.ssl.energy.gov/consortium.html
Instructions for the Editor (Owner, Utility, or ESCO)
This document, as downloaded in its original unedited form from the Consortium website, is intended to
be used as a model or template specification. It should be customized as needed to meet the particular
needs of each Owner, Utility, or ESCO. The unedited template is not intended to serve as a standard
specification, and therefore cannot result in a single list of qualified products; since criteria will vary
from municipality to municipality, a product may qualify for one while not qualifying for another.
The template is composed of two separate documents:
1. The body of the specification and appendices (beginning with Appendix B) included at the end.
2. Appendix A, to be inserted by the Editor (after printing) before Appendix B. The Editor may
choose ONE of two versions of Appendix A, depending on available information.
a. System Specification (application efficacy), which characterizes luminaire performance
based on site characteristics such as mounting height, pole spacing, number of drive
lanes, input power, and required light levels and uniformity.
b. Material Specification (luminaire efficacy), which characterizes luminaire performance
without consideration of site characteristics.
These three files are kept separate to allow for independent maintenance, while preventing
redundancies and contradictions between documents. Again, note that only ONE of the two versions of
Appendix A should be used on any given project. If both versions were used for the same project,
luminaire efficacy could (inappropriately) negate application efficacy, thereby potentially excluding
superior luminaires from consideration.
NOTE: Hidden text in red italicized font provides guidance for the editor throughout these documents.
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The cover page and this page may be edited or removed as desired.
(insert owner/utility/esco name here)
Performance Specification for LED Roadway Lighting
PART 1 – GENERAL
1.1 REFERENCES (may separate into Normative and Informative)
The publications listed below form a part of this specification to the extent referenced.
Publications are referenced within the text by their basic designation only.
(reference any pertinent City standards or specifications here)
A. American National Standards Institute (ANSI) The Consortium will monitor progress of the draft
ANSI C136.37‐20xx (American National Standard For Roadway and Area Lighting Equipment—
Solid State Light Sources Used in Roadway and Area Lighting) and ANSI C82.SSL1 (SSL Drivers).
Note that no standard currently exists for luminaire labeling.
1. ANSI C136.2‐2004 (R2009), American National Standard for Roadway and Area Lighting
Equipment—Luminaire Voltage Classification
2. ANSI C136.3‐2005, American National Standard for Roadway and Area Lighting
Equipment—Luminaire Attachments
3. ANSI C136.10‐2006, American National Standard for Roadway Lighting Equipment ‐
Locking‐Type Photocontrol Devices and Mating Receptacle Physical and Electrical
Interchangeability and Testing
4. ANSI C136.13‐2004, Roadway and Area Lighting Equipment ‐ Metal Brackets for Wood
Poles
5. ANSI C136.14‐2004, American National Standard for Roadway and Area Lighting
Equipment ‐ Elliptically Shaped, Enclosed Side‐Mounted Luminaires for Horizontal‐
Burning High‐Intensity Discharge (HID) Lamps
6. ANSI C136.16‐2009, American National Standard for Roadway and Area Lighting
Equipment—Enclosed Post Top‐mounted Luminaires
7. ANSI C136.21‐2004, American National Standard for Roadway and Area Lighting
Equipment—Vertical Tenons Used with Post Top‐mounted Luminaires
8. ANSI C136.25‐2009, American National Standard for Roadway and Area Lighting
Equipment – Ingress Protection (Resistance to Dust, Solid Objects and Moisture) for
Luminaire Enclosures
9. ANSI C136.31‐2001, American National Standard for Roadway Lighting Equipment –
Luminaire Vibration
10. ANSI C136.32‐2006, American National Standard for Roadway and area lighting
equipment ‐ enclosed setback luminaires and directional floodlights for high‐intensity
discharge lamps
B. American Society for Testing and Materials International (ASTM)
1. ASTM B117‐97 – Standard Practice for Operating Salt Spray (Fog) Apparatus
2. ASTM G53 – Standard Practice for Operating Light and Water Exposure Apparatus
(Fluorescent UV – Condensation Type) for Exposure of Nonmetallic Materials
C. Illuminating Engineering Society of North America (IESNA) The Consortium will monitor progress
of the draft IES DG‐22‐10 (Design Guide for Residential Street Lighting)
1. DG‐4‐03, Design Guide for Roadway Lighting Maintenance
2. LM‐79‐08, IESNA Approved Method for the Electrical and Photometric Measurements of
Solid‐Sate Lighting Products
3. LM‐80‐08, IESNA Approved Method for Measuring Lumen Maintenance of LED Light
Sources
4. RP‐8‐00, ANSI / IESNA American National Standard Practice for Roadway Lighting
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
5. RP‐16‐05 and addenda, “Nomenclature and Definitions for Illuminating Engineering”
(The Consortium may eventually add its own Glossary/Definitions section.)
6. TM‐3‐95, A Discussion of Appendix E ‐ "Classification of Luminaire Lighting Distribution,"
from ANSI/IESNA RP‐8‐83
7. TM‐15‐07, “Luminaire Classification System for Outdoor Luminaires”
8. TM‐15‐07 Addendum A, “Backlight, Uplight, and Glare (BUG) Ratings”
D. National Electrical Manufacturers Association (NEMA)
1. ANSI/NEMA/ANSLG C78.377‐2008 – American National Standard for the Chromaticity of
Solid State Lighting Products
E. National Fire Protection Association (NFPA)
1. NFPA 70 – National Electrical Code (NEC)
F. Underwriters Laboratories (UL)
1. UL 1449, Surge Protective Devices
2. UL 1598, Luminaires
1.2 RELATED DOCUMENTS (reference complementary city/utility standards or specifications here)
A. Contract Drawings and conditions of Contract (including General Conditions, Addendum to the
General Conditions, Special Conditions, Division 01 Specifications Sections and all other Contract
Documents) apply to the work of this section.
1.3 QUALITY ASSURANCE
A. Before bulk purchase, site Owner may request standard production model luminaire samples
identical (including LED package) to product proposed to be installed for inspection. Owner may
request independent testing of sample luminaires to verify luminaire performance and
compliance with the specifications.
B. After installation, site Owner may perform field measurements and/or send luminaires off for
independent laboratory testing to enforce warranty provisions for lumen maintenance. (Field
measurements can be confounded by differences between design and as‐built, ambient
temperature, and vegetation. It may be more realistic/enforceable to instead send luminaire(s)
off for testing at 25C ambient per LM‐79. The Consortium may address these issues, and
statistical significance of sample sets, in a separate guidance document.)
1.4 LIGHTING SYSTEM PERFORMANCE
A. Energy Conservation
1. Connected Load
a. Roadway lighting shall have maximum luminaire input wattage as specified for
each luminaire type in Appendix A
2. Lighting Controls
a. See section 2.2 below.
B. Photometric Requirements
1. Roadway lighting shall meet the general criteria provided in the body of this
specification and the particular criteria for each luminaire type defined in Appendix A
1.5 REQUIRED SUBMITTALS FOR EACH LUMINAIRE TYPE
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
A. Product cutsheets
1. Shall indicate complete and unique catalog number for product submitted
2. All components of catalog number shall be identifiable as options and explained
3. Luminaire input current, LED drive current, and nominal Correlated Color Temperature
(CCT) shall be clearly indicated. NOTE: Luminaire input current is often different from
LED drive current. LED drive current is an important factor in estimating LED useful
lifetime.
4. Shall include complete specifications for LED light source(s), including make/model #
5. Shall include complete specifications for LED driver(s), including make/model #
6. Shall include complete specifications for any integral controls, including make/model #
7. Shall include documentation supporting claims of luminaire recyclability
B. Luminaire photometric report per IES LM‐79 including
1. Name of independent test laboratory
a. The test laboratory must hold National Voluntary Laboratory Accreditation
Program (NVLAP) accreditation for the IES LM‐79 test procedure or must be
qualified, verified, and recognized through the U.S. Department of Energy’s
CALiPER program. For more information, see
http://www1.eere.energy.gov/buildings/ssl/test_labs.html.
2. Report number
3. Date
4. Complete luminaire catalog number, consistent with submitted product cutsheet
5. Description of luminaire, LED light sources, and LED driver(s)
6. Photometry
7. Colorimetry
C. Computer‐generated point‐by‐point photometric analysis of maintained light levels as per
Appendix A.
1. Calculations shall be for maintained values, i.e. Light Loss Factor (LLF) < 1.0, where LLF =
LLD x LDD x LATF, and
a. Lamp Lumen Depreciation (LLD) = 0.70, consistent with typical L70 ratings for
useful lifetime Note that, to allow apples‐to‐apples comparison of products of
differing L70 duration, it is assumed that a proper economic analysis will be
performed. Contact DOE for additional guidance if qualifying luminaires will
instead be compared (ultimately) on the simple basis of first‐cost. Information
on more complete methods of economic analysis is available online at:
http://www.wbdg.org/resources/lcca.php#rcas
b. Luminaire Dirt Depreciation (LDD) = 0.90, as per IES DG‐4 for an enclosed and
gasketed roadway luminaire installed in an environment with airborne
particulate matter less than 150 g/m3 and cleaned ever four years . Local
particulate data can be found online at http://www.epa.gov/airtrends/pm.html .
c. Luminaire Ambient Temperature Factor (LATF) = 0.99 This default value would
apply to a location with maximum monthly average temperature (MMAT) of
29°C (85°F), assuming a 0.25% decrease in output per degree Celsius above 25°C
ambient. MMAT is used here as an approximation of the worst‐case nighttime
ambient temperature; if desired, this value can be determined using data
available at http://cdiac.ornl.gov/epubs/ndp/ushcn/ushcn_map_interface.html.
2. Calculation/measurement points shall be per IES RP‐8 Appendix A
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
D. Documentation supporting claims of expected L70 useful life, as per Appendix B
1. Option 1
a. Provide IES LM‐80 report
b. Provide ISTMT report (see Appendix B)
c. Provide chart illustrating interpolation between TMP curves from LM‐80 data
for lumen maintenance at TMP from ISTMT report
i.
TMP interpolation is only valid for same drive current
2. Option 2
a. Provide LM‐79 report at 0 hours of operation (already described above)
b. Provide LM‐79 report at 6,000 hours of operation
E. Written product warranty as per section 1.6 below
1. Includes coverage of lumen maintenance
F. Safety certification and file number per the NEC. Applicable testing bodies are determined by
the US Occupational Safety Health Administration (OSHA) as Nationally Recognized Testing
Laboratories (NRTL) and include: CSA (Canadian Standards Association), ETL (Edison Testing
Laboratory), and UL (Underwriters Laboratory).
G. For American Recovery & Reinvestment Act (ARRA) projects, submit the following Buy American
documentation
1. Manufacturers listed on the current NEMA Listing of Companies Offering Outdoor
Luminaires Manufactured in U.S.A. for Recovery Act Projects
(http://www.nema.org/gov/economic‐stimulus) need only provide a copy of the
document
2. Other manufacturers shall submit documentation as per the DOE Guidance on
Documenting Compliance with the Recovery Act Buy American Provisions
(http://www1.eere.energy.gov/recovery/buy_american_provision.html)
1.6 WARRANTY
A. Provide a written five year on‐site replacement warranty covering material, fixture finish, and
workmanship. On‐site replacement includes transportation, removal, and installation of new
products. Finish warranty shall include warranty against failure or substantial deterioration such
as blistering, cracking, peeling, chalking, or fading.
B. Provide a written five year replacement material warranty for defective or non‐starting LED
source assemblies.
C. Provide a written five‐year replacement material warranty on all drivers (power supplies).
D. Provide a written five year replacement warranty for luminaires exhibiting inadequate lumen
maintenance at end of warranty period.
1. Lumen depreciation is assumed to follow an exponential decay function of the form L =
100e‐αt as per Appendix B, and luminaires are assumed to operate at full power an
average of 12 hours per day over the course of each year. Lumen maintenance shall be
as indicated in Table 1 below, depending on rated useful life. (NOTE: Contact DOE for
revised values if a different warranty period or different lifetime rating is desired.)
Table 1. Required Lumen Maintenance at End of 5‐year Warranty Period
Minimum lumen maintenance
L70 lifetime claim (hrs)
at 21,915 hours operation (%)
35,000
80.0
Adapted from the DOE MSSLC Model Spec, Version B.3
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Comment [JRT1]:
NOTE: This section will be updated when IES TM‐21
is released.
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Performance Specification for LED Roadway Lighting
50,000
100,000
85.5
92.5
2. Warranty shall cover all LED light sources (packages or modules/arrays) including but
not limited to the LED die, encapsulate, and phosphor. If the expected useful life of the
luminaire system as defined in Section Appendix B is not maintained, then the
manufacturer shall replace the light source(s) or luminaire as needed.
E. Warranty period shall begin on date of possession. The supplier will provide the site Owner with
appropriate signed warranty certificates. The site Owner shall receive certificates prior to final
payment.
PART 2 – PRODUCTS The Consortium will monitor progress of the draft ANSI C136.37 and consider
revising portions accordingly.
2.1 LUMINAIRE REQUIREMENTS
A. General Requirements
1. Luminaires shall be as specified for each type in Appendix A.
2. Rated luminaire wattage shall be actual, accounting for any reduction in efficiency due
to sub‐optimal loading of driver(s).
3. Luminaires of the same type shall be provided by one manufacturer.
4. Luminaires shall be rated for operation in ‐40°C to +50°C ambient. Edit values as
appropriate for your location, based on maximum nighttime (evening/dusk)
temperatures for your location, as per NOAA data available online at
http://www.ncdc.noaa.gov/oa/climate/stationlocator.html. Also consider the possibility
of undesired daytime operation due to malfunctioning photocontrol.
5. Fully assemble and electrically test luminaires before shipment from factory.
6. Luminaire arm bolts shall be 304 stainless steel or zinc plated steel and Grade 8.
7. Effective Projected Area (EPA) and weight of the luminaire shall not exceed the values
indicated in Appendix A. Owner MUST verify load capacity of poles to be used. Consult
luminaire/pole manufacturer data and AASHTO wind speed maps.
8. 80% of the luminaire material by weight shall be recyclable at end of life. Design
luminaire for ease of component replacement and end‐of‐life disassembly. See the
Federal Trade Commission (FTC) “Green Guides” for the use of environmental marketing
claims (http://www.ftc.gov/bcp/grnrule/guides980427.htm) regarding recycled content
and recyclability.
9. The luminaire shall be subjected to 100,000 cycles of 2 Gs at the resonant frequency of
the luminaire (between 5 and 30 Hz) applied at the center of gravity of the luminaire on
3 primary axes per ANSI C136.31 without damage to the luminaire. The luminaire shall
be fully functional upon completing the test.
10. Luminaire manufacturer shall submit reliability reports indicating that the manufacturer
of the LED (chip, diode, or package) has performed JEDEC (Joint Electron Devices
Engineering Council) reliability tests on the LEDs as follows:
a. High Temperature Operating Life (HTOL)
b. Room Temperature Operating Life (RTOL)
c. Low Temperature Operating Life (LTOL)
d. Powered Temperature Cycle (PTMCL)
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
e.
f.
g.
h.
Non‐Operating Thermal Shock (TMSK)
Mechanical Shock
Variable Vibration Frequency
Solder Heat Resistance (SHR)
B. Driver
1. Shall be Reduction of Hazardous Substances (RoHS) compliant. (see
http://www.rohs.eu/english/index.html)
2. Rated maximum case temperature shall be suitable for operation in the luminaire
operating in the ambient temperatures indicated in section 2.1.A above
3. Input
a. Shall accept voltage indicated in Appendix A
b. Shall accept 50/60 Hz
4. Shall be UL Class I or II
5. Shall have a minimum Power Factor (PF) of 0.90
6. Shall be compatible with controls specified in section 2.2 below
C. Electrical immunity
1. Luminaire shall meet all requirements of this specification after being subjected to the
tests defined in ANSI C136.2.
a. Voltage classification shall be consistent with voltage indicated in Appendix A
(NOTE: The ANSI standard classifies for 60 Hz, not 50 Hz. Also, test samples are
design, not production.)
2. Surge protection devices, if utilized
a. Shall reset automatically
b. Shall fail “open” to protect luminaire
c. Shall be field‐replaceable
d. Shall conform to UL 1449
D. Electromagnetic interference
1. Shall have a maximum Total Harmonic Distortion (THD) of 20%
2. Shall comply with FCC 47 CFR part 15 non‐consumer RFI/EMI standards
E. Electrical safety
1. Luminaire shall be listed for wet locations.
2. Luminaires shall have locality‐appropriate governing mark and certification.
3. Internal luminaire conductors shall have insulation rated to exceed the maximum
temperature inside the luminaire.
4. A means shall be provided for grounding the noncurrent‐carrying metal parts of the
luminaire
F. Housing finish
1. All housing finishes shall be baked‐on enamel, anodized, or powder‐coated.
2. Luminaire housing/chassis coating shall be capable of surviving ASTM B117 Salt Fog
environment for 1000 hrs minimum without blistering or peeling. The coating shall
demonstrate gloss retention of greater than or equal to 90% for 1000 hrs exposure QUV
test per ASTM G53 UVB313, 4 hr UV‐B 60°C/4 hr Condensation 50°C.
G. Mounting Requirements
1. Post Top Luminaires (Ref. C136.16)
a. Meet the requirements of Section 5 and accept one of the tenon sizes in Table 3
of ANSI C136.3 or comply with ANSI C136.21.
b. Provide a stop to limit the depth of insertion.
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
c. Provide for firmly attaching and plumbing the luminaire on the tenon.
Consideration must be given to possible reduction in attachment strength due
to cold flow of materials, vibration, or other conditions.
d. Prevent the entrance of wildlife by limiting openings around the pipe tenon
mounting area to 6.35 mm (1/4”) over the range of tenon sizes and leveling
adjustment. This may be accomplished by the use of supplemental closures.
2. Side‐Mounted (slip‐fitter) Luminaires (Ref. ANSI C136.14)
a. Accept a straight tubular section of pipe tenon, either 1‐1/4” or 2”, in
accordance with Table 2 of ANSI C136.3 and Section 7 of ANSI C136.13.
b. Provide a shoulder or stop to limit the depth of insertion of the pipe tenon
during installation.
c. Permit leveling through no less than ± 3° from the axis of attachment.
d. Prevent the entrance of wildlife by limiting openings around the pipe tenon
mounting area to 6.35 mm (1/4”) over the range of tenon sizes and leveling
adjustment. This may be accomplished by the use of supplemental closures.
e. Provide a suitable means to secure the luminaire to the pipe tenon.
Consideration must be given to possible reduction in attachment strength due
to cold flow of materials, vibration, or other conditions.
3. Set‐Back or Floodlight luminaires using a trunnion or yoke mount (Ref. ANSI C136.32)
a. Must have a yoke or trunnion with a centered mounting hole of 19.9 mm ± 2.4
mm (25/32” ± 3/32”) diameter. See Figure 1 of ANSI C136.32.
b. Permit aiming from 0° to at least 90°. The luminaire shall have a protractor,
aiming sight, or provision for indicating the aiming angle. Zero degrees (0°) shall
be straight down (Nadir).
4. Set‐back or Floodlight Luminaires using a swivel‐tenon mount (Ref. ANSI C136.32)
a. Must accept a 2” pipe tenon per ANSI C136.3 or a 3” (76.2 mm) or 4” (101.6
mm) diameter vertical tenon per ANSI C136.21.
b. Must provide a shoulder or stop to limit the depth of insertion of the pipe tenon
during installation if a tenon adapter is used.
c. Permit aiming from 0° to at least 90°. The luminaire shall have a protractor,
aiming sight, or provision for indicating the aiming angle. Zero degrees (0°) shall
be straight down (Nadir).
H. Serviceability
1. A terminal block with a minimum of two line‐side pressure‐type wire connectors having
slotted‐head screws shall be securely mounted in the luminaire so that incoming
conductors will clear all other internal components. Each connector shall accept one
conductor, either solid or stranded, from 8 American Wire Gauge (AWG) to 14 AWG
copper, or from 6 AWG to 10 AWG aluminum.
2. All internal components shall be assembled and pre‐wired so that the luminaire can be
energized by line connections at the terminal block.
3. Internal luminaire design shall incorporate modular electrical connections.
4. The serviceable portion of the luminaire shall be equipped with a latch to secure the
access door and permit access to serviceable components. The latch shall be operable
with protective gloves but without tools. The hinge shall be designed so that the access
door will not accidentally disengage or cause any damage when it is unlatched without
restraint.
I. Resistance to the elements
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
1. Optical cavity shall be a minimum IP‐65 as per ANSI C136.25.
2. Electrical cavity shall be a minimum IP‐54, or all electrical components and connections
shall be IP‐54 or rated for damp location.
3. Transmissive optical components shall be thermally suited for the application and shall
consist of UV‐stable polycarbonate, acrylic or glass.
4. Mechanical design of protruding external surfaces (heat sink fins) for thermal
management shall facilitate hose‐down cleaning and discourage debris accumulation.
5. Thermal management shall be passive, not active (no fans, pumps, or liquids).
6. Luminaire wattage shall not increase by more than 0.2% per °C for ambient
temperatures below 25°C.
J. IES TM‐15 limits for Backlight, Uplight, and Glare (BUG Ratings) shall be as specified for each
luminaire type in Appendix A. NOTE: The familiar “cutoff” classification system has been
superseded by the Backlight‐Uplight‐Glare (BUG) rating system established in IES TM‐15
Addendum A. Further, “cutoff” classifications (which are based on relative photometry) cannot
be applied to LED luminaires. IES LM‐79 requires absolute photometry for LED luminaires, and
no standard exists for rating LED “lamp” output. BUG ratings are presently best established by
determining BUG ratings of existing luminaires. If this is not feasible, definitions for Lighting
Zones and guideline restrictions for uplight and glare can be found in Tables 6‐8 and Appendix B
of the CBEA LED Site Lighting Performance Specification, available online at
http://apps1.eere.energy.gov/buildings/publications/pdfs/alliances/cbea_led_site_lighting_spec
.pdf)
1. Calculations shall be for initial values, i.e. Light Loss Factor (LLF) = 1.0
K. Correlated Color Temperature (CCT)
1. If nominal CCT specified in Appendix A is listed in Table 2 below, measured CCT and Duv
shall be as listed in Table 2.
Table 2. Allowable Nominal CCT (adapted from NEMA C78.377)
Allowed CCT from LM‐79 Report
Manufacturer‐Rated
Nominal CCT (K)
Measured CCT (K)
Measured Duv
2700
2580 to 2870
‐0.006 to 0.006
3000
2870 to 3220
‐0.006 to 0.006
3500
3220 to 3710
‐0.006 to 0.006
4000
3710 to 4260
‐0.005 to 0.007
4500
4260 to 4746
‐0.005 to 0.007
5000
4745 to 5311
‐0.004 to 0.008
5700
5310 to 6020
‐0.004 to 0.008
6500
6020 to 7040
‐0.003 to 0.009
2. If nominal CCT specified in Appendix A is not listed in Table 2, measured CCT and Duv
shall be as per the criteria for Flexible CCT defined in NEMA C78.377
L. Minimum Color Rendering Index (CRI): No requirement (Recall that HPS is approx 21, but note
that ongoing research appears to indicate color contrast/discrimination/difference is an
important and as‐yet overlooked component of visibility.)
2.2 CONTROL REQUIREMENTS This section is very rough, awaiting proposed content from the controls
subcommittee.
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
A. General
1. Photocontrols
a. Luminaire twist‐lock photocontrol receptacles shall be per ANSI C136.10.
i.
Receptacle shall be adjustable to aim the control window in the North
direction without the use of tools.
ii.
The plug‐receptacle interface temperature shall not be greater than
90°C when the luminaire is energized.
iii.
Luminaire housing shall not interfere with operation of photocontrol.
b. 15 to 30 second built‐in time delay to prevent response to momentary lightning
flashes, car headlights or cloud movements.
c. Photocontrol shall be designed to fail with the luminaire energized (fail‐safe).
d. Settings to energize the lighting system when the north sky light decreases to
approximately XX footcandles, and maintains the system energized until the
north sky light increases to approximately XX footcandles. Note: XX values to be
supplied by Owner. A TURN‐ON/TURN‐OFF ratio ≤ 5:1 (the lights either turn on
or off when the photocell measures 5x the required illuminance) should be used.
2. End‐of‐Life indicator (optional)
a. Provide End‐of‐Life mechanism for the luminaire. When the LED die output has
reached end of useful life, the luminaire should enter a visible “failure mode”,
e.g. intermittent flashing or flickering which does not compromise safety.
2.3 PRODUCT MANUFACTURERS
(Choose one of the following. Choose the latter for ARRA projects)
A. Any manufacturer offering products that comply with the required product performance and
operation criteria may be considered.
B. Any qualified Buy American manufacturer offering products that comply with the required
product performance and operation criteria may be considered.
PART 3 – EXECUTION
3.1 INSTALLATION
A. Disconnect all power sources prior to installation.
B. Follow manufacturers’ recommended installation procedures.
3.2 TESTING & COMMISSIONING
A. Set appropriate time delay. Adjust sensitivity setting as necessary.
3.3 MANUFACTURER SERVICES
A. Manufacturers shall provide installation and troubleshooting support via telephone.
END OF SECTION
Adapted from the DOE MSSLC Model Spec, Version B.3
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Performance Specification for LED Roadway Lighting
Appendix B
Evaluating LED Lumen Maintenance
Comment [JRT2]:
NOTE: This section will be revised when IES TM‐21
is released.
Useful lifetime estimates for LED lighting products are typically given in terms of the expected operating
hours until light output has diminished to 70% of initial levels (denoted L70 life). Lumen maintenance
requirements are given in Table B‐1 below to qualify lifetime claims, assuming an exponential decay
function of the form L = 100e‐αt, where (NOTE: Contact DOE for revised values if a different lifetime
rating is desired.)
L = % of initial light output at “t” hours of operation
e = the constant (approx value of 2.7) used as the base of the natural logarithm
α = a solved positive‐value constant
t = time of data point
Table B‐1. Lumen Maintenance Prerequisites
L70 lifetime claim (hrs)
35,000
50,000
100,000
Minimum lumen maintenance
at 6,000 hours (%)
94.1
95.8
97.9
Alternatively, a standard exponential decay function (e.g.,) may be used to estimate the allowable
lumen degradation of the LED module/array. The long‐term test data (minimum of 7 data points at
1,000 intervals) must be curve‐fit to determine the exponential decay of the data. This can be done in
various software programs and must take the form L=L0e‐αt, where
L = % of initial light output at “t” hours of operation
L0 = % of initial light output at 1,000 hours
e = the constant (approx value of 2.7) used as the base of the natural logarithm
α = a solved positive‐value constant
t = time of data point
The applicant may demonstrate compliance with the 6,000 hour lumen maintenance thresholds
identified above in one of two ways: Option 1 (Component Performance) or Option 2 (Luminaire
Performance).
Option 1: Component Performance
Under this compliance path, the applicant demonstrates that the LED package or module/array
(light source) tested per the LM‐80 test procedure operates at or below a specified temperature
and drive current when operated (in situ) in the luminaire under consideration. To be eligible
for the Component Performance option, ALL three of the conditions below must be met. If ANY
of the conditions is not met, the component performance option may not be used and the
applicant must use Option 2 for compliance.
1. The LED light source has been tested according to LM‐80, and the light source must
demonstrate minimum percent lumen maintenance as per Table 1 above.
2. The LED light source manufacturer prescribes/indicates a temperature measurement
point (TMPLED) on the light sources.
Adapted from the DOE MSSLC Model Spec
P a g e | B‐1
(insert owner/utility/esco name here)
Performance Specification for LED Roadway Lighting
3. The LED light source TMPLED is accessible to allow temporary attachment of a
thermocouple for measurement of in situ temperature. Access via a temporary hole in
the housing, tightly resealed during testing with putty or other flexible sealant is
allowable.
The luminaire complies per Option 1 if:
1. The LED light source drive current specified by the luminaire manufacturer is less than or
equal to the drive current specified in the LM‐80 test report. Note that the input current
to the luminaire is often NOT the input current to the LED light source.
2. For the hottest LED light source in the luminaire, the temperature measured at the TMPLED
during In Situ Temperature Measurement Testing (ISTMT) is less than or equal to the
temperature specified in the LM‐80 test report for the corresponding drive current or
higher, within the manufacturer’s specified operating current range.
a. The ISTMT laboratory must be approved by OSHA as a Nationally Recognized
Testing Lab (NRTL), must be qualified, verified, and recognized through DOE’s
CALiPER program, or must be recognized through UL’s Data Acceptance
Program.
b. The ISTMT must be conducted with the luminaire installed in the appropriate
application as defined by ANSI/UL 1598 (hardwired luminaires).
Option 2: Luminaire Performance
Under this compliance path, the applicant demonstrates compliance with the lumen
maintenance requirement by submitting LM‐79 photometric test data for the entire luminaire,
comparing initial output (time = 0 hours) to output after 6,000 hours of operation (time ≥ 6,000
hours). The test reports must demonstrate a minimum percent lumen maintenance as per
Table B‐1 above when operated in the appropriate application as defined by ANSI/UL 1598
(hardwired luminaires). The test laboratory must hold NVLAP accreditation for the LM‐79‐08
test procedure or must be qualified, verified, and recognized through the U.S. Department of
Energy (DOE)’s CALiPER program.
Adapted from the DOE MSSLC Model Spec
P a g e | B‐2
(insert owner/utility/esco name here)
Performance Specification for LED Roadway Lighting
APPENDIX C
INVERSE BALLAST EFFICIENCY – APPROXIMATE RANGE
PROVIDED FOR REFERENCE
Adapted from the DOE MSSLC Model Spec
P a g e | C‐1
