Recommendations for Testing and Evaluating Luminaires
Contents
1. Photometric testing Grid size Sin by amp in Distance Luminaire center mounted 6 in from the measuring plane 6 in Vertical test area 60 in by 604 Vertical surface 1 A Sa _ M Vertical overall average illuminance at 10 C 278 60 105 204 405 551 202 103 59 36 Jen a a oe ot 261 Vertical huminoue Sux et 10 C 605 6 im 76 131 252 475 6889631 259 131 73 43 _ 4 _ 1 i i 79 118 29 3 50 7 7229665 23 144 79 48 ee o 22 ued ans anaie antt 72 4 82 148 305 56 4 732 31 0 158 103 51 Rien Sate Reed bss Note The values have been corrected by the 95 155 303 557 73 0 304 181 92 56 0 scaling ratio Dividing the values by the scaling ratio gives the _ _ luminance at room temperature 25 82 158 298 52 6 71 7 4 4 92 158 297 536 72 79 154 233 724 aoe 78 142 279 435 705 647 286 a7 81 E 117 220 485 645 22 127 67 41 SUMMARY all values at 10 C Total luminous flux reaching the application area 695 6 im Fixture input power 20 4 W Freezer extra input power Pp 13 6 Ww Total power Pres 340 Application Efficacy 20 5 im w Fixture input voltage 115 9V Fixture input current O 18A Freezer operating temperature 10 0 C Lighting2. 8 Display case luminaire application efficacy 9 CCT CRI and 9 Measuring 9 Appendix A Photometric Measurements nnmnnn 11 Selection 11 Photometric measurements 11 Testing A 11 Appendix B Test Setup for Near field Photometry 1 12 Appendix Sample Report 15 Appendix Coefficient of Performance COP 16 Appendix E Estimating Luminaire Application Efficacy 17 Referentes aaa a e ara eaae E iaaa 18 amp adaa 19 a 19 Lighting Research Center Rensselaer ASSIST recommends Introduction This document outlines a recommendation for testing and evaluating
3. Research Center 1 ASSIST recommends Appendix D Coefficient of Performance COP In thermal engineering the efficiency of a refrigerator is indicated by the coefficient of performance COP which is defined as follows Cengel and Turner 2001 COP Heat dissipation output Electric power input COP expresses how many units of heat can be removed per unit of electric power in steady state operation However COP is a function of temperature outside the refrigerator and temperature inside the refrigerator The closer those two temperatures the higher the COP Simply COP is a dimensionless ratio of output cooling to input electric power In the calculation of application efficacy Step 26 COP is required to characterize the excess freezer power Pr to remove the heat generated by luminaires in the freezer COP values may be available from freezer manufacturers If the information is not provided users can follow step 19 to step 24 to calculate the COP values or use the typical values listed in Table D1 as an estimate Table D1 Typical COP values for different refrigeration applications and temperatures Application Temperature Range COP pened Westphalen et al 1996 Cengel and Turner 2001 Preparation rooms 4 C 2 C 25 F 35 F 2 5 3 0 De caryana 9 C 4 C 15 F 25 F 23 26 produce Meats 12 C 9 C 10 F 15 F 2 3 2 6 Frozen foods 32 C 26 C 25 15
4. F 1 2 1 5 Ice cream 37 C 32 C 35 F 25 F 1 0 1 2 Note In Westphalen et al 1996 Fahrenheit was used as the unit of temperature Lighting 16 Research Center ASSIST recommends Appendix E Estimating Luminaire Application Efficacy Summary Application Lumens at Room Temperature 25 C Attach thermocouple to the lamp per manufacturer s recommendations Mount the luminaire vertically or horizontally onto the test setup Turn on the luminaire for 100 hours for seasoning Before taking measurements turn on the luminaire until the light output stabilizes minimum 90 minutes Measure vertical illuminances at the center of each grid square and record the luminaire operating temperature Ts and all electrical parameters Calculate lumens the task area 60 in by 60 Aij 144 in ft where Aij is the individual square area in and Eij is the illuminance within a grid square Application Lumens at Freezer Case Temperature Place the luminaire inside a test freezer Place an illuminance meter at a distance of 1ft from the luminaire Turn on the luminaire while the freezer is off After stabilization measure the illuminance value E1 from the meter placed 1 ft from the luminaire Measure the luminaire operating temperature T 1 which should be within 1 C the value measured at room temperature Turn on the freezer and allow it to stabilize a min
5. Lighting Research Center LRC n d Survey of local supermarkets conducted May 2008 Data not published Rea M S 2000 IESNA Lighting Handbook Reference and Application 9th ed New York Illuminating Engineering Society of North America Rundquist R A K F Johnson and D J Aumann 1993 Calculating lighting and HVAC interactions Atlanta GA ASHRAE Journal Tyler Refrigeration 2007 Installation and Service Manual Model No NS5FGNA N5NGNA Niles MI Tyler Refrigeration Westphalen D R A Zogg A F Varone and M A Foran 1996 Energy Savings Potential for Commercial Refrigeration Equipment Final report prepared by Arthur D Little Inc for the Building Equipment Division Office of Building Technologies U S Department of Energy Lighting Research Center Rensselaer ASSIST recommends Acknowledgments ASSIST and the Lighting Research Center would like to thank the following for their review and participation in the development of this publication China Solid State Lighting Alliance and GE Lumination About ASSIST ASSIST was established in 2002 by the Lighting Research Center at Rensselaer Polytechnic Institute to advance the effective use of energy efficient solid state lighting and speed its market acceptance ASSIST s goal is to identify and reduce major technical hurdles and help LED technology gain widespread use in lighting applications that can benefit from this rapidly advancing lig
6. voltage current active and apparent power power factor and total harmonic distortion Step 7 Record the light source operating temperature 25 Step 8 Calculate the luminous flux 5 Im reaching the display plane 60 in by 60 in Do52 Evy Ay 144 in ft where Ev is the vertical illuminance on an individual square in footcandles and is the area of one grid square i e 36 in Proper conversion factors need to be used if the illuminance measurements are taken in units of lux Step 9 Calculate the average vertical illuminance fc on the display plane EVaverage 25 N where N is the number of illuminance measurements i e the number of grid squares N 100 Other metrics of uniformity can be calculated as well for example maximum to average and maximum to minimum ratios However the illuminance measurements and the uniformity ratios may not be representative of the final system until the contribution from adjacent luminaires is taken into account and the correction factor R see step 18 is applied Step 10 Generate a test report with the data recorded in steps 1 through 9 A sample report is shown in Appendix C Sample Report Form Cold temperature measurements Light output scaling factor Step 11 Place the luminaire in a testing freezer in the same position as used in the application In the case of linear fluorescent lamps when transporting the lamp from
7. be expressed as the ballast or driver life as the ballast or driver components may have a shorter life than the light source Lighting Research Center m Rensselaer ASSIST recommends Appendix A Photometric Measurements The procedures described below are taken from existing standards published by the Illuminating Engineering Society of North America IESNA the Commission Internationale de CIE and are to be used as further guidance to setting up and conducting the tests described in this document Selection of luminaire Luminaires selected for test should be clean and representative of the manufacturer s regular product Ballasts or drivers regularly furnished as part of the luminaire should be used to operate the lamps during the test and should be mounted in their normal locations as to the lamps IESNA LM 41 98 1998 Photometric measurements Testing conditions Air movement The luminaire or test lamp during calibration shall be tested in relatively still air A maximum airflow of 0 07 meter second 13 ft minute is suggested IESNA LM 46 04 2004 Lamp seasoning Test lamps should be seasoned for a certain number of hours such that their characteristics remain constant during the test to be conducted IESNA LM 54 99 1999 IESNA LM 46 04 2004 Luminaire stabilization preburning The luminaire requires a certain number of hours from start to allow the lamp and ballast driv
8. the photometric electrical and thermal performance of white light luminaires for upright refrigerator and freezer cases with vertically and horizontally mounted lamps This testing recommendation is applicable to all light source technologies This recommendation was developed by the Lighting Research Center LRC at Rensselaer Polytechnic Institute in collaboration with members of the Alliance for Solid State Illumination Systems and Technologies ASSIST The intent of this document is to encourage common consistent methods of testing and data presentation for ease of interpretation and comparison which will assist refrigerated display case manufacturers and end users in selecting suitable luminaires for this application The target audience for this document is refrigerated display case manufacturers and purchasers luminaire manufacturers electric utilities state agencies _ standards setting organizations Background The IESNA Lighting Handbook Rea 2000 defines a luminaire as a device to produce control and distribute light It is a complete lighting unit consisting of the following components one or more lamps optical devices designed to distribute the light sockets to position and protect the lamps and to connect the lamps to a supply of electric power and the mechanical components required to support or attach the luminaire Supermarkets commonly use lighted refrigerated and freezer display cases to store and d
9. the measurement rack used in steps 1 through 9 to the testing freezer keep the lamp in the same position and avoid shaking the lamp Sudden changes in orientation of the lamp can cause the mercury to migrate resulting in longer stabilization times when the lamp is operated again Step 12 Place an illuminance photodetector see Appendix A at a distance of 1 ft from the luminaire The purpose of this step is to measure the relative light output from the luminaire in at least two temperature conditions It is therefore very important to keep the relative position between the photodetector and the Lighting Research Center K ASSIST recommends luminaire constant Mechanical means should be used to fix the photodetector and prevent unintended movement Note The spectral response of the photodetector may be temperature dependent Therefore the photodetector needs to be characterized at the freezer operating temperature In addition condensation the photodetector should be prevented Step 13 Turn the luminaire on while the freezer is off Allow the luminaire to operate for at least 90 minutes to stabilize the light output The light output is considered stabilized when the differences in sequential readings are no greater than 0 5 with a minimum of three readings taken approximately 15 minutes apart see Appendix A Testing conditions LED stabilization preburning Monitor T to verify that it too has stabilized and i
10. ASS f i recommends Recommendations for Testing and Evaluating Luminaires for Refrigerated and Freezer Display Cases For upright refrigerator and freezer cases with vertically and horizontally mounted lamps Volume 5 Issue 1 November 2008 A publication of the Alliance for Solid State Illumination Systems and Technologies Lighting R search Center Rensselaer ASSIST recommends Copyright 2008 by the Alliance for Solid State Illumination Systems and Technologies ASSIST Published by the Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy New York USA Online at http Awww Irc rpi edu All rights reserved No part of this publication may be reproduced in any form print electronic or otherwise without the express permission of the Lighting Research Center This ASSIST recommends was prepared by the Lighting Research Center at the request of the Alliance for Solid State Illumination Systems and Technologies ASSIST The recommendations set forth here are developed by consensus of ASSIST sponsors and the Lighting Research Center ASSIST and the Lighting Research Center may update these recommendations as new research technologies and methods become available Check for new and updated ASSIST recommends documents at http www Irc rpi edu programs solidstate assist recommends asp ASSIST Sponsors Bridgelux China Solid State Lighting Alliance Cree Everlight Electronics C
11. a standard distance of 6 in from the luminaire which represents a common distance between the luminaire and the front of the shelf rack in a refrigerated display case Hussmann Corporation 2007 Tyler Refrigeration 2007 The illuminance measurements on the grid provide useful information to purchasers of display cases and designers because they can estimate the final light levels and uniformity in the application But because it is difficult to create a testing setup to take all the illuminance measurements at the cold temperature of the application this method is divided in two main stages First the illuminance measurements are taken at a room ambient temperature of 25 C Second a correction factor is calculated for the light output at the actual cold operating temperature inside the display case from relative light output measurements at 25 C and at the actual application operating temperature The correction factor is then applied to the illuminance measurements and the total light output illuminating the task plane which is derived from these measurements to obtain values representative of the actual operating conditions The following steps and Appendix B provide details on how to set up the measurement grid The method considers a test area of 60 in by 60 in which is the typical height of upright refrigerated display cases and the typical width of two doors Multi door configurations are very common in supermarkets and convenience stor
12. ance metrics developed for lighting applications must be technology independent With certain technologies the amount of heat experienced by the light source and the ballast or driver affects the overall performance of the luminaire in terms of light output color appearance and rendering lumen maintenance lamp life and ballast or driver life To obtain realistic performance data for a luminaire the test environment must mimic the actual environment where the luminaire would be used And in order to understand the effect that heat has on luminaire performance the operating temperature must be measured accurately Certain temperature points within a light source or ballast are known to have a direct relationship with performance However often these temperature points are not accessible once the light source and ballast or driver are packaged into a luminaire Therefore accessible temperature points that correlate to those known points that affect performance must be identified by the manufacturer Proposed Method In refrigerated display case lighting applications the distance between the luminaire and the illumination task plane varies depending on the location of the face of the displayed merchandise Typically it is very small in the range of 3 in to 10 in Therefore it is not possible to make accurate illuminance predictions using traditional intensity distributions measured with far field photometry methods Thus in this app
13. eezer display cases LRC 1994 recent surveys show that a ratio of up to 4 to 1 may be desirable LRC n d Traditionally refrigerated display cases use linear fluorescent lamps but now white light emitting diodes LEDs are often being used as the light source in these luminaires Other less common systems use remote light sources and fiber optics to deliver illumination to the merchandise Many performance specifications traditionally used in the lighting industry assume the performance Lighting Research Center ASSIST recommends of the lamp or lamp ballast combination tested under an ideal environment as the performance of the complete luminaire However this assumption is not correct because light sources perform differently inside luminaires and this performance changes depending on application conditions Generally the luminaire design e g the optics used to transfer the flux from the source to the application housing with proper thermal management etc influences the overall light output luminous efficacy color and life of the system Ultimately the amount of luminous flux exiting the luminaire within the optical beam that illuminates the task the color of the light within the optical beam and the system lamp ballast or driver life when used in an application are the most useful performance characteristics for the end user Further to allow users to make meaningful comparisons between products perform
14. eezer in two conditions a Luminaire OFF baseline Porr b Luminaire ON Pon Step 21 Both measurements should be taken after the freezer temperature stabilizes in some cases a minimum of 48 hours may be needed for temperature stabilization Step 22 Measure input power P 1 to the luminaire at room operating temperature see step 17 Lighting Research Center 9 ASSIST recommends Step 23 Measure input power to the luminaire at freezer operating temperature Step 24 To calculate the excess power used by the freezer for dissipating heat load due to the luminaire subtract the freezer power with luminaire OFF Pore condition from the freezer power with luminaire ON Pon condition Prr Step 25 Calculate the ratio of the input power to the luminaire to the extra power demanded by the freezer Pfr Rundquist et al 1993 Rrr Pi2 Pfr Step 26 Compare the ratio calculated in step 25 with the coefficient of performance COP of the freezer if the information is available from the manufacturer to validate results see Appendix D Step 27 Calculate total power demanded by the lighting luminaire and the freezer to dissipate the luminaire s thermal load Prota Pi Pfr Display case luminaire application efficacy calculation Step 26 Calculate the luminaire s application efficacy using the following equation Application Efficacy AE appiication A summa
15. ent lamps Step 2 Turn the luminaire on for 100 hours for seasoning the light source in the luminaire or as recommended by the manufacturer or applicable standards when available Step 3 Place the test setup in a room at 25 C 1 C ambient temperature with still air air movement velocity less than 0 07 meter second or 13 feet minute see Appendix A Testing conditions LED stabilization preburning Install the luminaire onto the mounting frame following the manufacturer s recommendation Appendix B provides details of the luminaire testing setup for near field photometry and how to layout the testing grid Lighting Research Center ASSIST recommends Step 4 Turn the luminaire on and allow it to operate for at least 90 minutes to stabilize the light output The light output is considered stabilized when the differences in sequential readings are no greater than 0 5 with a minimum of three readings taken approximately 15 minutes apart see Appendix A Testing conditions LED stabilization preburning Monitor T to verify that it too has stabilized Step 5 Place an illuminance meter at the center of each individual grid square and record the vertical illuminance Ev in units of footcandles fc Proper conversion factors need to be used in the following steps if the illuminance measurements are taken in units of lux Repeat this procedure for all squares Step 6 Record the luminaire electric quantities
16. er to reach normal operating temperatures before starting the performance testing Restarting of the lamp during the test should be avoided However if restarting is necessary the test should be continued only when complete stabilization of the luminaire is again achieved The lamp is considered stabilized when monitoring light output over a period of 30 minutes produces differences of sequential readings no greater than 0 5 with a minimum of three readings taken approximately 15 minutes apart IESNA LM 41 98 1998 Test voltage and current The luminaire shall be operated at its rated voltage or current If the rated voltage or current is a range the center value shall be used as a test condition IESNA LM 49 01 2001 Instrumentation Instruments shall be selected and used with care to ensure accurate measurements Instruments should be calibrated a minimum of once a year Instrument indications should have good reproducibility The effect if any of instruments on measured quantities shall be addressed See IESNA LM 28 89 IES Guide for the Selection Care and Use of Electrical Instruments in the Photometric Laboratory 1989 for detailed information Photodetectors Use photodetectors with a spectral response that follows the CIE spectral luminous efficiency VA curve IESNA LM 41 98 1998 In addition it is important that the spatial sensitivity of the photodetector be cosine corrected Because of the near field conditions and the al
17. es and can be tested as well using this method Most manufacturers now offer luminaires designed for two typical vertical mounting locations namely center mullions and end caps The method described below considers testing one luminaire type at a time either center mounted or end cap but it is possible to test different configurations as well For example the same procedure would apply to a test that includes a center mounted and two end cap luminaires If the test is performed for each luminaire type separately then it is possible to estimate the final illuminance uniformity and efficacy values by simply adding up the corresponding contributions from each luminaire In this method the test area for a center mounted luminaire is 30 in wide to either side of the luminaire Because of the very short distance from the luminaire to the test plane 6 it is unlikely that luminaires will make a meaningful contribution to the light level beyond the 30 in limit If the luminaire is specifically designed to contribute illumination beyond this proposed area the test should be performed with an extended area and should be properly documented in the test report Room temperature 25 C measurements Photometric and electric measurements Step 1 Attach a thermocouple to the lamp to measure the lamp temperature T per the manufacturer s suggestions e g the board temperature for LEDs or the cold spot bulb wall temperature for linear fluoresc
18. ht source Lighting Research Center 1 Rensselaer
19. imum of 48 hrs may be needed Measure the illuminance value E2 from the meter placed 1 ft from the luminaire Measure the corresponding lamp temperature Ts2 and all electrical parameters Calculate the ratio of the illuminance at freezer case operating temperature E2 to the illuminance at room temperature E1 R E2 Calculate corrected application lumens at freezer operating temperature application 5 Power Measurements Measure luminaire input power at room temperature 25 C Pu Monitor freezer input power while the luminaire is OFF Prr oFF Measure luminaire input power at freezer operating temperature Pi2 Monitor freezer input power while the luminaire is ON Prr on Calculate excess power used by the freezer for dissipating heat due to lighting Pfr Peron Prr orr Calculate total system power luminaire and freezer PL2 Pfr Refrigerated Freezer Case Lighting Luminaire Application Efficacy Calculate luminaire application efficacy AE application Protal Lighting 17 Research Center ASSIST recommends References Alliance for Solid State Illumination Systems and Technologies ASSIST 2007 ASSIST recommends LED life for general lighting Volume 1 Issues 1 7 Troy N Y Lighting Research Center Internet http www Irc rpi edu programs solidstate assist recommends ledlife asp Cengel Y A and R H Turner 2001 Fundamentals of Thermal Fluid Scie
20. isplay merchandise that requires refrigeration or freezing There are many types of refrigerated and freezer display cases however the types considered in this document are upright single door and multi door cases with vertical lamps or horizontal lamps In these types of cases the luminaires are usually mounted vertically at the door mullions or horizontally on the top or bottom of the cases These luminaires produce localized lighting on the displayed merchandise i e task or accent lighting Usually for refrigerated display case lighting applications 3 to 10 footcandles fc average on the vertical surface is recommended Rea 2000 However common practice shows much higher light levels in the order of 50 fc to 300 fc and in certain cases even higher LRC 1994 2006 One possible explanation for the higher light levels inside the display case is to counteract the veiling reflections sometimes seen on the glass doors when the ambient light level in the store is high To avoid veiling reflections the luminance of the merchandise has to be greater than the luminance of the objects reflected on the glass door One way of accomplishing this objective is by increasing the illuminance on the merchandise Therefore depending on the ambient lighting in the space the vertical illuminance on the merchandise may need to be higher or lower Although past studies have shown that the ratio of inside to outside illuminance is about 1 6 in supermarket fr
21. lane Alternatively the surface can be painted with a low reflectance matte black paint such as Rosco TV Black 05740 Draw a grid on the display plane as shown in Figures B1 B2 and B3 The individual sections of the grid shall be square and the squares shall be 6 in by 6 in Mount the test luminaire onto an L shaped mounting frame per the manufacturer s recommendation for mounting the luminaire in the application If the luminaire is mounted vertically the center of the luminaire should coincide with the center line of the display plane If the luminaire is mounted horizontally the luminaire should be kept at the same height as the top edge of the display plane measurements should be taken with the test luminaire positioned 6 in away from the display plane which represents a common distance between the luminaire and the front of a shelf rack in a refrigerated display case Hussmann Corporation 2007 Tyler Refrigeration 2007 It is also important to reduce the contribution from extraneous lighting on the measurement surfaces If the testing cannot be performed in a dark room block any ambient and reflected light with light absorbing material around the testing planes Available from http www edmundoptics com onlinecatalog displayproduct cfm productID 1502 amp search 1 3 Available from http www rosco com us scenic tv_paint asp Lighting 12 Research Center ASSIST recommends Figure B1 Per
22. lication near field photometry is more appropriate than traditional far field photometry Furthermore near field illuminance measurements can be used to derive the amount of luminous flux illuminating the task plane a metric that is necessary to rate the energy efficiency of a luminaire This is an important point because the luminous flux on the task plane is the most useful not all the flux that exits the luminaire and should be the only one accounted for in rating the efficacy of a luminaire Finally because the operating temperature of most light sources affects the light output when determining the luminaire luminous efficacy one must consider only the light that is useful for lighting the task at the refrigerated display case operating temperature and the total power used by the luminaire and the refrigerator for removing the excess heat generated by the luminaire within the case Luminaire luminous efficacy Total lumens on the task Total power As stated this method calls for calculating the luminous flux that reaches the task plane when the luminaire and refrigerated display case are at the intended cold Although there are other failure mechanisms that can cause a luminaire to fail in application only the lamp and ballast or driver failure is considered in this document Lighting Research Center s ASSIST recommends operating temperature The calculation method is based illuminance measurements on a grid at
23. most grazing angles between the luminaire and the end of the measuring task plane grid special consideration needs to be taken to ensure that the cosine correction is acceptable Many laboratory grade photodetectors have an average 2 value of 1 to 2 anda maximum relative error within 5 in the range of 65 to 85 Commercial photodetectors can have low average 2 values but high relative errors at angles higher than 65 Lighting 11 Research Center ASSIST recommends Appendix B Test Setup for Near field Photometry Measurements The objective is to create a luminaire test condition for near field photometry that can keep the lamp and the ballast or driver at operating temperatures similar to what they would be in real life applications for refrigerated and freezer display cases Figures B1 B2 and B3 show the schematic of three proposed test setups including the testing display plane luminaire mounting frame and measurement grid The luminaire mounting positions are vertical center vertical side and horizontal top for Figures B1 B2 and B3 respectively These are the three most common positions for luminaires installed in refrigerator or freezer cases A 60 in by 60 in display plane should be created The surface of the display plane should be made of or covered by a light absorbing material such as black cloth e g duvetyn or Edmund Optics flock paper to avoid light interference between the luminaire and the p
24. nces New York McGraw Hill Hussmann Corporation 2007 Technical Data Sheet Impact RLN Bridgeton MO Illuminating Engineering Society of North America IESNA 1989 IES Guide for the Selection Care and Use of Electrical Instruments in the Photometric Laboratory IESNA LM 28 1989 New York Illuminating Engineering Society of North America Illuminating Engineering Society of North America IESNA 1998 Approved Method for Photometric Testing of Indoor Fluorescent Luminaires IESNA LM 41 98 New York Illuminating Engineering Society of North America Illuminating Engineering Society of North America IESNA 1999 IESNA Guide to Lamp Seasoning IESNA LM 54 99 New York Illuminating Engineering Society of North America Illuminating Engineering Society of North America IESNA 2001 Approved Method for Life Testing of Incandescent Filament Lamps IESNA LM 49 01 New York Illuminating Engineering Society of North America Illuminating Engineering Society of North America IESNA 2004 Approved Method for Photometric Testing of Indoor Luminaires Using High Intensity Discharge or Incandescent Filament Lamps IESNA LM 46 04 New York Illuminating Engineering Society of North America Lighting Research Center LRC 1994 A amp P Food Market DELTA Portfolio Lighting Case Studies Vol 1 1 Lighting Research Center LRC 2006 Field Test DELTA Snapshots LED Lighting In Freezer Cases Troy N Y Lighting Research Center
25. o Ltd Federal Aviation Administration GE Lumination ITRI Industrial Technology Research Institute Lighting Science Group Lite On NeoPac Lighting New York State Energy Research and Development Authority OSRAM SYLVANIA OSRAM Opto Semiconductors Permlight Philips Lighting Philips Solid State Lighting Solutions Photonics Cluster UK The Lighting Association Seoul Semiconductor United States Environmental Protection Agency USG WAC Lighting Lighting Research Center Technical Staff in alphabetical order Tianming Dong Jean Paul Freyssinier Nadarajah Narendran Jennifer Taylor Lighting Research Center 2 Rensselaer ASSIST recommends Contents cece stress eae ee ees 4 BACK 4 Proposed 1 5 Room temperature 25 C measurements 6 Photometric and electric 6 Cold temperature measurement 7 Hight output scaling TACtOM e ee a ee 7 Display Case power measurements
26. ry of the above procedures leading to an estimate of luminaire application efficacy is provided in Appendix E CCT CRI and chromaticity Presently no testing method has been established for measuring the color properties of the beam of a refrigerator or freezer case lighting luminaire Therefore use the data provided by the white light source manufacturers for CCT CRI and CIE x y values Alternatively an illuminance meter capable of measuring CIE x y and CCT values can be used to measure these metrics at both room ambient temperature and at the application s cold temperature This alternative is particularly useful if any of the optical components e g reflector diffuser of the luminaire changes the appearance of the light emitted by the lamps Measuring luminaire life For life testing refrigerator or freezer case luminaires the luminaire must be mounted according to the manufacturers recommendation for installing the luminaire in the intended application Thermocouples must be attached to the temperature measurement points identified by the manufacturer for monitoring the lamp and driver temperatures Life testing must be carried out at refrigerator or freezer operating temperature For life testing LED luminaires follow the procedures explained in ASSIST recommends LED life for general lighting ASSIST 2007 Lighting Research Center 9 ASSIST recommends Note For long life light sources the luminaire life may
27. s within 1 C of Ts25 c Because the luminaire is now operating inside an enclosed environment the ambient temperature inside the freezer may be higher than the 25 C at which the illuminance measurements of step 5 were taken thus causing T to be higher than 25 In this case proper ventilation may be needed so that the target 1 C of Ts25 c is achieved Step 14 Measure the illuminance value E1 with the photodetector placed 1 ft from the luminaire Record the light source operating temperature T as in step 7 Step 15 Turn the freezer on and allow it to stabilize to the same temperature as in an actual application in some cases a minimum of 48 hours may be needed for lamp and freezer stabilization Step 16 Measure the illuminance value E2 with the photodetector placed 1 ft from the luminaire and record the lamp temperature T 2 once again as in step 7 Step 17 Record the luminaire electric quantities voltage current active and apparent power power factor and total harmonic distortion Step 18 Calculate the ratio R between the illuminance at freezer case operating temperature E2 and the illuminance at room temperature E1 R E2 E1 Step 19 Scale the luminous flux calculated at room temperature step 8 by the ratio R The resulting value is the application luminous flux given by application xR Display case power measurements Step 20 Monitor the average input power to the fr
28. spective and plan views of the luminaire test setup vertical center mounting Luminaire positioned 6 in away from the display plane Display Plane 60 in by 60 in NL N Luminaire mounting frame Measurement grid 6 in by 6 in h Driver or ballast Figure B2 Perspective and plan views of the luminaire test setup vertical side mounting Luminaire positioned 6 in away from the display oie Display Plane 60 in by 60 in pf ie Driver or ballast Lightin Research Center Rensselaer ASSIST recommends Figure B3 Perspective and plan views of the luminaire test setup horizontal top mounting Luminaire positioned 6 in away from the display plane Display Plane 60 in by 60 in AN we Luminaire mounting frame Measurement grid 6 in by 6 in Driver or ballast Lighting Research Center 13 Rensselaer ASSIST recommends Appendix C Sample Report Form Product information Date October 22 2007 Luminaire description and catalog number Generic 8 Fluorescent Lighting System center mounted Light source One 8 fluorescent lamp Correlated color temperature at 25 C 3500 K Color rendering index at 25 C 80 Chromaticity coordinates CIE 1931 at 25 0 4053 0 3907 Fixture length in 60 inches
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