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Page 1 of 21 Specification for The Supply of LED Road Lighting Luminaires August 2016 Rev: B TCS 065 - 2016
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  • Page 1 of 21

    Specification for The Supply of LED Road Lighting Luminaires August 2016 Rev: B

    TCS 065 - 2016

  • TCS 065 - 2016 Rev. B

    Page 2 of 21 LED Road Lighting Luminaires

    TCS 065 2016

    COPYRIGHT Road Corporation trading as VicRoads. All rights reserved. This document remains the property of VicRoads. No part of this document may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of VicRoads

    Foreword This specification has been developed by VicRoads. It is one of a number of technical specifications, and associated standard drawings, which set out the requirements for roadside ITS devices, traffic signal equipment, road lighting luminaires and other electrical equipment and associated devices and control systems. This specification is intended for use in all relevant works undertaken by or on behalf of VicRoads. VicRoads Standard Drawings, Specifications and Guidelines are available for downloading from VicRoads website at the following address under Tenders & Suppliers, http://www.vicroads.vic.gov.au/itsspecs Specification updates. VicRoads specifications and associated standard drawings are subject to periodic review. To keep the specifications up to date, amendments or new editions are issued as necessary. It is therefore important for users of VicRoads specifications to ensure that they have the latest version and associated amendments. Road Operations 60 Denmark Street Kew 3101 Phone: (03) 9854 2103 Fax: (03) 9854 2319

    Revision History

    Revision Date Description

    B August 2016 Draft - Minor updates

    A March 2016 2016 version released

  • Rev. B TCS 065 - 2016

    LED Road Lighting Luminaires Page 3 of 21

    PREFACE A. THIS SPECIFICATION This is a revised version of VicRoads specification developed to cover the requirements of Light Emitting Diode (LED) Road Lighting Luminaires. This version was originally developed to include the requirements of AS/NZS 60598.2.3:2015, Particular requirements Luminaires for road and street lighting and the new Australian Standards SA/SNZ TS 1158.6:2015 Technical Specification for road lighting luminaires. B. CHANGES TO THIS SPECIFICATION This Revision B has been developed to include the following updates:

    Some minor edits. Inclusion of maximum number of variations to each luminaire type. Change to warranty requirements in line with other State Road Authority requirements. This

    change has been made to bring VicRoads warranty period in line with other jurisdictions. The following table details previous versions to this specification:

    Date Revision Owner Purpose of Revision

    March 2016 VicRoads ITS New, fully revised version of this specification to reflect the release of the new Australian Standard Technical Specification TS1158.6:2015

    January 2015 VicRoads ITS Revision B Minor editorial updates

    November 2014 (Original)

    VicRoads ITS Original specification TCS 065-2015

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    Contents

    SECTION 1 SCOPE AND GENERAL .............................................................................. 61.1 SCOPE .................................................................................................................................... 61.2 BACKGROUND .................................................................................................................... 61.3 DEFINITIONS ........................................................................................................................ 7

    SECTION 2 RELATED SPECIFICATIONS AND DRAWINGS .................................. 82.1 GENERAL .............................................................................................................................. 82.2 EXCEPTIONS AND CLARIFICATION TO AS/NZS 60598.2.3 ......................................... 92.3 EXCEPTIONS AND CLARIFICATIONS TO SA/SNZ 1158.6 ............................................ 9

    SECTION 3 ACRONYMS AND ABBREVIATIONS .................................................... 10

    SECTION 4 REQUIREMENTS ....................................................................................... 114.1 GENERAL REQUIREMENTS ............................................................................................ 114.2 PHOTOMETRIC REQUIREMENTS .................................................................................. 114.3 LED DRIVER ....................................................................................................................... 114.4 PHOTOELECTRIC CELL ................................................................................................... 124.5 MECHANICAL REQUIREMENTS .................................................................................... 124.6 MARKING ........................................................................................................................... 12

    SECTION 5 PERFORMANCE AND TESTING ............................................................ 135.1 GENERAL ............................................................................................................................ 135.2 LEDS ................................................................................................................................... 13

    5.2.1 IES LM-80 .................................................................................................................... 135.2.2 IES TM-21 .................................................................................................................... 13

    5.3 LUMINAIRE ........................................................................................................................ 135.3.1 IES LM-84 .................................................................................................................... 135.3.2 IES TM-28 .................................................................................................................... 145.3.3 Alternative to LM-84 Test ............................................................................................ 14

    5.4 WARRANTY PERIOD ........................................................................................................ 14

    APPENDIX A ......................................................................................................................... 15PHOTOMETRIC PERFORMANCE CRITERIA ............................................................................ 15

    APPENDIX B ......................................................................................................................... 17REQUIREMENTS FOR TYPE APPROVAL .................................................................................. 17

    APPENDIX C ......................................................................................................................... 19DETERMING LUMEN MAINTENANCE OF HPSM LEDS ....................................................... 19

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    SECTION 1 SCOPE AND GENERAL

    1.1 SCOPE

    1.1.1 This specification covers the requirements of LED road lighting luminaires intended for use in VicRoads Category V3 lighting.

    1.1.2 All Category V3 LED road lighting luminaires intended for use in VicRoads owned lighting

    schemes shall comply with:

    SA/SNZ TS 1158.6, AS/NZS 60598.2.3, and This specification.

    1.2 BACKGROUND

    1.2.1 LED road lighting luminaires provide an energy efficient, environmentally friendly alternative to traditional high pressure sodium (HPS) road lighting luminaries for lighting applications on VicRoads freeways, State highways and main roads within the State of Victoria for new installations.

    1.2.2 LED road lighting luminaires are intended to provide a one-for-one replacement option for

    existing lighting installations. 1.2.3 Traditional HPS lamps typically provide an expected life of around 26,000 hours. LED road

    lighting luminaires are designed to provide an expected life of 100,000 hours. See Appendix C for information on determining the life expectancy of LED luminaires.

    1.2.4 High power surface mount (HPSM) LEDs are typically used for road lighting. A wide

    viewing angle and high brightness make these LEDs suitable for this type of application. 1.2.5 The encapsulation resin contains UV inhibitors to minimize the effects of long term exposure

    to direct sunlight, resulting in an expected stable light output over the life of the LED. 1.2.6 LED road lighting luminaires use less power than HPS and thus help reduce greenhouse gas

    emissions and lower electricity costs. 1.2.7 LED road lighting luminaires produce a white or bluish-white light typically in the colour

    temperature range of 4,000K (white) to 4,500K (bluish-white). This colour temperature range appears to the human eye similar to normal daylight.

    1.2.8 This compares to HPS lamps which produce a yellow coloured light typically in the colour

    temperature range of 2,500-2,800K. 1.2.9 The whiter light source of the LED, and the ability to direct the light, results in better

    roadway illuminance than HPS at lower luminance intensities.

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    LED Road Lighting Luminaires Page 7 of 21

    1.2.10 The directionality of LEDs also substantially reduces light loss that is typically associated with HPS.

    1.2.11 LED road lighting luminaries can produce the same amount of light (lumens) as HPS with

    significantly less power use (watts). 1.2.12 Advantages of using LED include

    No use of mercury or hazardous material; A white light; A better quality of light; Instant on ability; Longer lifer than traditional HPS. Lower power consumption than HPS Reduced CO2 emissions (approximately 29%)

    1.3 DEFINITIONS

    1.3.1 The definitions used in AS/NZS 1158.0 shall apply to this specification.

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    SECTION 2 RELATED SPECIFICATIONS AND DRAWINGS

    2.1 GENERAL

    2.1.1 The fabrication and supply of all components shall conform to all relevant Australian Standards. 2.1.2 All installation works shall conform to the relevant VicRoads specifications and related

    specifications and standards as indicated throughout this document. 2.1.3 The following related Australian Standards are defined:

    AS/NZS 3000 Wiring Rules

    AS/NZS 1158.1.1 Lighting for roads and public spaces Part 1.1: Vehicular traffic (Category V) lighting Performance and design requirements

    AS/NZS 1158.1.2 Lighting for roads and public spaces Part 1.2: Vehicular traffic (Category V) lighting Guide to design, installation, operation and maintenance

    AS/NZS 1158.2 Lighting for roads and public spaces Part 2: Computer procedures for the calculation of light technical parameters for Category V and Category P lighting

    SA/SNZ TS 1158.6 Technical Specification, Lighting for roads and public spaces Part 6: Luminaires Performance

    AS/NZS 60598.1 Luminaires General requirements and tests AS 60529 Degrees of protection provided by enclosures (IP code) AS 60038 Standard voltages AS 61000.6.2 Generic standards Immunity for residential, commercial and light

    industrial environments

    AS 61000.6.3 Generic standards Emission standard for residential, commercial and light industrial environments

    2.1.4 The following International Standards are defined:

    IES LM-80-08 Approved Method: Measuring Lumen Maintenance of LED Light Sources

    IES TM-21-11 Projecting Long Term Lumen Maintenance of LED Light Sources IES LM-84-14 Measuring Luminous Flux and Colour Maintenance of LED Lamps,

    Light Engines and Luminaires IES TM-28-14 Projecting Long-Term Luminous Flux Maintenance of LED Lamps

    and Luminaires

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    2.2 EXCEPTIONS AND CLARIFICATION TO AS/NZS 60598.2.3

    The requirements of AS/NZS 60598.2.3 shall apply to LED luminaires with the exception of the following clauses.

    AS 60598.2.3 Clause Description Exception / Clarification

    3.6.1 Ingress protection Clause does not apply 3.6.2 Suspension wires Clause does not apply 3.6.4 Lamp holder Clause does not apply 3.6.6 Column integrated luminaires Clause does not apply 3.6.7 Column integrated luminaires Clause does not apply 3.6.8 Column integrated luminaires Clause does not apply 3.6.9 Column integrated luminaires Clause does not apply 3.9 Terminals Refer to Clause 3.6 of SA/SNZ TS 1158.6 3.13 Resistance to dust and moisture Refer to Clause 2.2.2 of SA/SNZ TS 1158.6

    2.3 EXCEPTIONS AND CLARIFICATIONS TO SA/SNZ 1158.6

    The requirements of SA/SNZ 1158.6 shall apply to LED luminaires with the exception of the following clauses.

    SA/SNZ 1158.6 Clause Description Exception / Clarification

    1.6.3 Coded information on exterior of luminaire

    For additional requirements see this Clause 5.6

    2.2.2 Ingress Protection Sub-clause (b) shall apply 2.2.3 Impact resistance See this Clause 5.3.3 2.8.2 Top-entry luminaires Clause does not apply 2.9.2 Post-top luminaires Clause does not apply 2.9.3 Top-entry luminaires Clause does not apply 3.2.2 Magnetic ballasts for high intensity

    discharge (HID) lamps Clause does not apply

    3.2.3 Ignitors Clause does not apply 3.3 Requirements for HID lamps Clause does not apply 3.4 Requirements for fluorescent lamps Clause does not apply 3.8.1 Luminaire switching - general See this Clause 5.4 3.8.2 Connection arrangement for

    luminaires with D2 base Clause does not apply

    5.3 Ballast losses Clause does not apply 5.7 Photometric tests requirements for

    SSL luminaires For additional requirements see this Clause 6.3

    Table 5.3 Correlated Colour Temperature For required CCT see this Clause 5.2.3 6.3 Photometric data For additional requirements see this Clause 6.3

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    SECTION 3 ACRONYMS AND ABBREVIATIONS 3.1 The acronyms used in this document shall be interpreted as follows:

    ARR The arrangement of luminaires in a lighting scheme as defined in AS/NZS 1158.0 and AS/NZS 1158.2

    AS Australian Standard

    CCT Correlated Colour Temperature

    HPS High Pressure Sodium

    HPSM High Power Surface Mounted

    IES Illuminating Engineering Society (of North America)

    IESNA Illuminating Engineering Society of North America

    IP Ingress Protection

    K Units of colour temperature expressed as degrees Kelvin

    LED Light Emitting Diode

    LTP Light Technical Parameters as defined in 1158.0

    NZS New Zealand Standard

    PE Cell Photo Electric Cell

    Wk Carriageway width as defined in 1158.0

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    SECTION 4 REQUIREMENTS

    4.1 GENERAL REQUIREMENTS

    4.1.1 The complete luminaire shall be capable of replacing existing HPS luminaires one-for-one and maintaining Category V3 lighting.

    4.1.2 LED luminaires shall meet Category V3 lighting requirements at pole spacings and luminaire

    heights detailed in Table A1 of Appendix A. 4.1.3 A maximum of two photometric variations per luminaire type (i.e. L1, L2 and L3) may be

    provided in order to meet the requirements of all configurations detailed in Table A1 of Appendix A.

    Note: An example of a luminaire version might be a luminaire designed with a standard

    throw and a forward throw variation to cater for different carriageway widths. 4.1.4 Where a luminaire is available in different versions, the luminaire shall be clearly marked to

    identify the version. See Clause 4.6 of this specification.. 4.1.5 The LED luminaire shall provide a minimum of 30% reduction of total system watts

    compared to the equivalent HPS luminaire.

    4.2 PHOTOMETRIC REQUIREMENTS

    4.2.1 LEDs shall be subject to photometric testing as described in Section 5 of this specification. 4.2.2 Luminous intensity output shall be designed to meet the minimum requirements for Category

    V3 road lighting after ten years field service. 4.2.3 LED luminaires shall provide a colour temperature within the range of 4,000-4,500K as

    specified in Table 5.3 of SA/SNZ TS 1158.6.

    4.3 LED DRIVER

    4.3.1 LED drivers shall meet the requirements as detailed in Table 4.1.

    Table 4.1 LED Driver Requirements Item Requirement

    Efficiency > 90% Dimming capable 1-10 Volt Temperature rating -20oC to +70oC Internal Protection Not less than IP65 Humidity Up to 95%

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    4.4 PHOTOELECTRIC CELL

    4.4.1 Luminaires supplied for VicRoads lighting schemes shall include a NEMA 7 pin socket in accordance with Clause 3.8.1(c) of SA/SNZ TS 1158.6.

    4.4.2 Unless otherwise specified in individual tender documents, the NEMA 7 pin socket shall be

    provided with a bridging plug installed.

    4.5 MECHANICAL REQUIREMENTS

    4.5.1 The construction and material of the luminaire shall comply with Section 2 of SA/SNZ TS 1158.6.

    4.5.2 The luminaire shall comply with minimum degree of protection as detailed in Clause 2.2.2 (b)

    of SA/SNZ TS 1158.6. 4.5.3 The complete luminaire shall achieve a resistance to external impact of not less than IK06 as

    detailed in Clause 2.2.3 of SA/SNZ TS 1158.6. 4.5.4 Fixing spigot entry shall be suitable for 43mm OD spigot.

    4.6 MARKING

    4.6.1 In addition to the external marking required by Clause 1.6.3 of SA/SNZ TS 1158.6,

    the exterior of the luminaire shall also be marked as shown in Figure 4.1 below.

    Figure 4.1: Example of additional external marking

    L2 T3

    LED Luminaire HPS Equivalent 1 = 150W 2 = 250W 4 = 400W

    Photometric Type T2 = standard arrangement T3 = Forward throw arrangement

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    SECTION 5 PERFORMANCE AND TESTING

    5.1 GENERAL

    5.1.1 The LED road lighting luminaires shall meet the values of Light Technical Parameters (LTPs) for Category V3 lighting as specified in Table 2.2 of AS/NZS 1158.1.1.

    5.1.2 Section 3.1 & 3.2 of AS/NZS 1158.2 shall apply to the calculation of the LTPs for Category

    V lighting. 5.1.3 For Category V3, the specific software package SAA STANSHELL is required to calculate

    the luminance-based LTPs. Appendix A of AS/NZS 1158.2 provides more information. 5.1.4 Appendix A details the minimum photometric performance requirements.

    5.2 LEDS

    5.2.1 IES LM-80

    5.2.1.1 LED light sources shall undergo testing in accordance with LM-80-08 for a minimum of 10,000 hours.

    5.2.2 IES TM-21

    5.2.2.1 Results of the LM-80 testing shall be entered into a standard TM-21 table. 5.2.2.2 At 60,000 hours, the TM-21 table shall indicate a lumen maintenance level of not less than

    95% (i.e. L95 of at least 60,000 hours in accordance with TM-21).

    5.3 LUMINAIRE

    5.3.1 IES LM-84

    5.3.1.1 Testing of the LED luminaire shall be undertaken in accordance with LM-84 as specified in Clause 5.7 of SA/SNZ TS 1158.6.

    5.3.1.2 The LED source in-situ case temperatures shall be measured and recorded as described in

    Clause 6.2 and Annex A IES LM-84.

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    5.3.2 IES TM-28

    5.3.2.1 The extrapolated lumen maintenance shall be calculated in accordance with TM-28 specified in Clause 5.7 of SA/SNZ TS 1158.6.

    5.3.2.2 The method used shall be in accordance with direct extrapolation as detailed in Clause 4.2.1

    of TM-28.

    5.3.3 Alternative to LM-84 Test

    5.3.3.1 The test duration for collecting data using the LM-84 method is 6,000 hours. This requirement can add substantial time to product testing prior to submission for approval.

    5.3.3.2 An alternative to undergoing the full IES LM-84 test is to carry out an in situ temperature

    measurement of the LEDs according to the procedure in LM-84 Annex A and at ambient temperature prescribed in AS/NZS 60598.2.3. This temperature data can then be applied to the TM-21 calculations as detailed in IES TM-21.

    5.4 WARRANTY PERIOD

    5.4.1 As stated in this Clause 1.2.3, the expected design life of LED luminaires is 100,000 hours operating life.

    5.4.2 To provide confidence that this will be achieved, the supplier shall provide a minimum

    warranty period of 10 years on-pole. The luminaire shall remain compliant with the luminance requirements for Category V3 lighting after 10 years.

    5.4.3 The term on-pole shall be deemed to mean that any failure of an LED luminaire that occurs

    during the warranty period will be rectified/replaced by the supplier at no cost to VicRoads. This shall include all labour and other associated costs of replacing the luminaire on the pole.

    5.4.4 Details of any warranty conditions shall be provided with the supply of any luminaires.

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    APPENDIX A

    PHOTOMETRIC PERFORMANCE CRITERIA

    (Normative) A1. LUMINAIRE OUTPUT A1.1 Due to the difference between LED and HPS, it is not possible to exactly compare the

    luminaire output between the two technologies. The LED is capable of producing the same roadway illuminance with less lumen output.

    A1.2 Table A1 provides the minimum required luminaire spacing for each LED luminaire type.

    Table A1 Photometric Parameters Luminaire

    Type Mounting

    Height (m)

    Wk (m)

    Over Hang (m)

    Spacing (m) Minimum Requirement

    ARR 1 ARR 3 ARR 6* L1 9 8 0 44 45 45

    (150W HPS 1.5 52 52 50 replacement) 2.0 52 52 50

    3.0 50 50 50

    L2 12.5 12 0 55 55 50 (250W HPS 1.5 60 65 60 replacement) 2.0 70 70 70

    3.0 70 70 70 14 0 55 50 1.5 60 55 2.0 55 50 3.0 55 55

    L4 15 14 0 65 75 63 (400W HPS 1.5 65 75 75 replacement) 2.0 75 75 80

    3.0 80 80 85 17 0 75 60 1.5 75 55 2.0 80 50 3.0 80 50

    * use 6m median width.

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    A1.2 For the purpose of clarity, the Designated ARR 1, 3 and 6 as detailed in AS/NZS 1158.2 have

    been reproduced in Figure A1 below.

    Figure A1 Designated Lighting Arrangements from AS/NZS 1158.2 A3. CALCULATING SPACING A3.1 Pole spacings shall be determined using SAA STAN in accordance with the requirements of

    AS/NZS 1158.2. A3.2 The following parameters shall be used in the SAA STAN calculations:

    Maintenance factor 0.8. Upcast - 5. Traffic flow One way

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    APPENDIX B

    REQUIREMENTS FOR TYPE APPROVAL

    (Normative) B1. GENERAL B1.1 To enable assessment for the purpose of granting Type Approval, the supplier is to submit a

    formal request to VicRoads for Type Approval accompanied by the following:

    a. A complete working sample of the LED luminaire. b. An outline drawing showing the general presentation and overall dimensions of the

    complete LED luminaire. c. A detailed assembly drawing exploded view of the complete luminaire.

    B1.2 Where the above information indicates that the luminaire may be suitable for VicRoads purposes, a Product Approval (PA) number will be issued. The supplier may then submit the product for formal evaluation to a VicRoads approved consultant.

    B1.3 Until a luminaire has been granted VicRoads Type Approval, it must not be offered or

    installed as part of any VicRoads project or other project that requires VicRoads Type Approved products.

    B2. INFORMATION TO BE PROVIDED WITH SUBMISSION TO CONSULTANT B2.1 The following documentation shall be provided with any submission:

    Evidence of compliance with each relevant clause of 60598.2.3. Evidence of compliance with each relevant clause of SA/SNZ TS 1158.6. Evidence of compliance with each clause of this specification.

    B2.2 The following test reports from an independent NATA accredited (or approved equivalent)

    test facility shall be provided with any submission:

    Photometric test report. Photometric data I-tables in the CIE 132 format as required by Section 4 of AS/NZS

    1158.2. Ingress Protection in accordance with AS60529 (SA/NZS TS 1158, Clause 2.2.2(b)). Resistance to impact to IK06 (SA/NZS TS 1158, Clause 2.2.3). Vibration test in accordance with AS 600068.2.6 (SA/NZS TS 1158, Clause 5.4). Impulse Voltage Test (SA/NZS TS 1158, Clause 5.5). Thermal Endurance and Thermal Testing Requirements (SA/NZS TS 1158, Clause 5.6).

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    B2.3 The following test reports shall be provided:

    Evidence of compliance with IES LM-79. Evidence of compliance with IES LM-80. Evidence of compliance with IES TM-21. Evidence of compliance with IES LM-84; Evidence of compliance with IES TM-28 (using the Direct Extrapolation method);

    Note: An acceptable alternative to IES LM-84 and IES TM-28 is to apply an in-situ LED

    temperature measurement to the IES TM-21 extrapolation. B3. OTHER REQUIRED TESTING

    a. The Product Compliance Consultant or other approved independent consultant shall undertake pole spacing calculations for comparison with those provided by the manufacturer

    b. Once the luminaire has been assessed as meeting the requirements of B1 and B2 above, a field test will be conducted for up to 12 months.

    c. Where a field test has been undertaken by another road authority, the results of this

    testing may be considered.

    d. VicRoads may require additional information or testing to be carried out as part of its evaluation of the product.

    e. The supplier is required to supply and install the LED luminaire at any nominated test

    site to demonstrate compliance with Category V3. f. VicRoads may require the supplier to cover the costs of an on-road light level survey.

    B4. ASSESSMENT PROCEDURE B4.1 The assessment procedure for a LED luminaire will include, but not be limited to, the following:

    a. Assessment of construction, workmanship and critical dimensions. b. Evaluation of the submitted data against the requirements of this specification. c. Pole spacing calculations will be undertaken by the consultant using an approved

    program (eg. PerfectLite) to demonstrate compliance with required pole spacings as detailed in Appendix A Table A1.

    d. Installation and testing of the LED luminaire. B4.2 Where some of these procedures have been completed prior to formal submission, the results

    will be considered in the evaluation, provided there is no relevant change in the design. The supplier is to state whether tests carried out prior to formal submission were carried out on an identical sample.

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    APPENDIX C

    DETERMING LUMEN MAINTENANCE OF HPSM LEDS

    (Informative) C1 BACKGROUND INFORMATION C1.1 The luminous intensity for LED light sources is known to degrade over time. This is referred

    to as lumen loss. The degree of degradation and the time over which this occurs depends on a number of factors. These factors include such things as:

    LED technology used; LED colour; Drive current applied to the LED; and Temperature of the LED junction.

    C1.2 To help prevent the LEDs from degrading beyond minimum required luminous intensity

    levels, new LEDs typically produce considerably higher luminous intensities than the minimum required.

    C1.3 The initial luminous intensity levels are typically calculated from accepted lumen loss factors. C1.4 Lumen loss factors applied to initial luminous intensities are intended to ensure that, at the

    end of anticipated life, the minimum value of luminous intensity will be maintained. C2 DETERMINING LUMEN LOSS OF LEDs C2.1 LED luminaires are required to be designed to provide a life expectancy of 100,000 hours

    however, actually testing LEDs for 100,000 hours is not practicable. C2.2 In order to determine the life of an LED, the Illuminating Engineering Society of North

    America (IESNA), together with the LED industry, developed a standard methodology for testing lumen maintenance of LEDs.

    C2.3 This methodology provides a common test methodology and has been widely accepted

    throughout the LED industry. This has resulted in two separate IESNA standards being produced. These are:

    1. LM-80 The standard method and procedure for measuring LED lumen depreciation of solid- state lighting sources, such as LED packages, modules and arrays; and 2. TM-21 This standard describes the recommended method for projecting lumen

    maintenance of an LED based on the results of LM-80.

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    C3 LUMEN MAINTENANCE OF A LED LIGHT SOURCE LM-80 TEST C3.1 To test the lumen maintenance of a LED of light source, LM-80 test requires:

    1. A minimum of 20 units of LEDs be tested at each of the temperature settings; 2. Conducting the tests at three different ambient temperature, 55oC, 85oC (LM-80

    specified) and a third temperature specified by the manufacturer using the same drive current;

    3. Recording the initial measurements of lumens and chromaticity as required; 4. Recording subsequent measurements of lumens and chromaticity at a nominal interval of

    1,000 hours; 5. Record a minimum of 6 measurements; 6. Additional measurements beyond 6,000 hours are encouraged; and 7. Using the recorded measurements to populate a TM-21 table to calculate the average

    extrapolated life expectancy to 70% of initial luminance (up to a maximum of six times the measurement period).

    C3.2 The resultant average lumen measurement at 6,000 hours is referred to as the average Lumen

    Maintenance at 6,000 hours. C3.3 The intent of this is to provide a guide as to the expected life of the LED under test. C3.4 At the completion of the test, a table of data for each LED tested will show the lumen

    depreciation over the test period. C3.5 A series of tests are carried out using different parameters such as ambient temperature and

    LED drive current. C3.6 Table 1 below is a sample of the LM-80 test report summary.

    Table C1: LM-80 Test Results

    Ambient Temp.

    LED Drive Current

    Test Period In hours

    Lumen Maintenance at end of test

    85oC 1000mA 13608 98.7%

    105oC 1000mA 12096 97.4%

    55oC 1500mA 12096 99.2%

    85oC 1500mA 12096 98.3% C4 TM-21 PROJECTION C4.1 Another standard developed by IESNA is TM-21, Projecting Long Term Lumen

    Maintenance of LED light Sources. This document was developed to provide a standard method for predicting future lumen maintenance levels based on the LM-80 test data.

    C4.2 Many manufacturers and authorities worldwide are adopting this standard for predicting LED

    lumen maintenance. C4.3 TM-21 takes data from LM-80 and applies a series of specific equations. From these results,

    lumen maintenance extrapolations are derived.

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    C4.4 TM-21 specifies that lumen maintenance values must not be projected beyond six times the

    test duration. i.e. if the LED has been tested for 10,000 hours, then the TM-21 projection should be limited to 60,000 hours.

    C4.5 The resulting lumen maintenance figure is expressed as a percentage of the initial measured

    lumen output, e.g. if the projected lumen output at 60,000 hours was 70% then lumen maintenance is expressed as L70.

    C5 DETERMINING LED LUMINAIRE PERFORMANCE C5.1 Another factor that affects the performance of LEDs is the design and construction of the

    luminaire. The performance of an LED when incorporated within a luminaire can be affected by such things as:

    The forward drive current through the LED; The LED driver unit; The LED junction temperature (i.e. the quality of heat sinking used);

    C5.2 To measure and determine the long term maintenance factors of LED luminaires, IESNA has

    developed the following two new standards:

    1. LM-84 The standard method for measuring luminous flux and colour of LED luminaires; and

    2. TM-28 The standard method for projecting long term luminous flux and colour of LED luminaires.

    C5.3 These IESNA standards have been referenced as the required method of determining lumen

    maintenance of LED luminaires in Clause 5.7 of SA/SNZ TS 1158.6.


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