March 26, 2012 Title: TEMPO 21 Report Prepared for: Sviazinvest, OJSC Prepared by: Cree Durham Technology Center (DTC) Ticket Number: 10806-T
Co NVLAP lab code 500070-0 The accreditation of the Cree Durham Technology Center by NVLAP (NVLAP lab code 500070-0) to satisfy the requirements of ISO/IEC 17025:2005 and IES LM-79-08 is presently in progress. This report contains data sets that are not covered by NVLAP accreditation. The measurement data sets contained in this report are related only to the items tested. This report must not be used by the customer to claim product certification, approval or endorsement by NVLAP, NIST or any agency of the federal government. This report was generated for: Sviazinvest, OJSC This report was generated by: The Cree Durham Technology Center 4600 Silicon Dr Durham, NC 27703 2 of 41
TEMPO 21 Checklist Thermal Solder Point Temperature Measurement Thermal Imaging With IR Camera Electrical Driver Efficiency Transient Analysis Power Analysis (PF, THD) n/a Dimmer Compatibility Test Dielectric Breakdown (Hi-pot) Vf/Current Balancing (Parallel Arrays Only) Mechanical Qualitative Construction Analysis Chemical compatibility Analysis X-ray of Printed Circuit Board Photometric and Optical Luminous Flux Radiant Flux Chromaticity (CRI, CCT, x-y, u -v, duv) Spectral Power Distribution (Visible Range) Illuminance (ft-cd or lux) Luminaire Efficacy (lm/w) Optical Efficiency Component Binning and Color Point Evaluation n/a Review Against ENERGY STAR criteria TM-21 Lifetime estimate 3 of 41
EXECUTIVE SUMMARY The Sviazinvest Street Light Model DKU 01-45x4-002-01 uses 45 Xlamp XM-L LEDs. The luminaire produces 15689 lumens with a 5226K CCT while consuming 193.7W of power. With an optical efficiency of nearly 90% the luminaire delivers 81 lm/w. Cree Services' TEMPO21 Evaluation process is a thorough multi-point evaluation and analysis of a customer s lighting product. Cree Application Engineering personnel perform a battery of thermal, electrical, mechanical and photometric tests and provide a comprehensive report that includes all relevant data to necessary to confirm the performance of the product. In addition to this standard set of tests, products will also be reviewed against appropriate ENERGY STAR criteria, TM-21 LED Lifetime estimates, and LM-79 conformant tests where applicable. Table 1 below provides a quick summary of the test data. Additional detailed test results are covered in the following pages. Criteria Result Total Luminous Flux (lm) 15689 Power (W) 193.7 Tsp and Tj ( C)¹ 64.3 / 74 Power Factor 0.948 Lumens per Watt (LPW) 81 Optical Efficiency (%) 90 Driver Efficiency (%) 88 CCT (K) 5226 CRI (Ra) 81 Chromaticity (x-coord) 0.3393 Chromaticity (y-coord) 0.3525 LED Lumen Maintenance² Projected L₇₀(6K) : 362,000 Reported L₇₀(6K) : 36,300 ENERGY STAR Not Applicable Table 1: Summary of Test Results ¹ Measured at ambient temperature of 21.5ºC. ² Per IES TM-21-2011 4 of 41
Incoming Inspection All samples are subjected to a visual, physical inspection to ensure that the product was not damaged during shipping. Two samples were received and were packaged in individual cardboard boxes as shown in Figures 1and 2. No physical damage or other problems were observed. The samples were powered on and appeared to be operating normally as shown in Figure 3. As received pictures Figure 1: As-Received Picture #1 5 of 41
Figure 2: As-Received Picture #2 Figure 3: As-Received Picture #3 6 of 41
Photometric Testing Photometric testing includes measurements of luminous flux, radiant flux, chromaticity, correlated color temperature (CCT) and color rendering index (CRI). Luminaire evaluation was performed at Cree s photometric testing lab in Durham, NC. A 2-meter Labsphere integrating sphere Model CSLMS-7660 using the 4 geometry method and spectrometer MC-9801:3683 is used to conduct the test. Testing is performed per Cree standard photometric testing protocols, which follow IES LM-79-08¹ and includes procedures such as: absorption correction using a NIST traceable lamp and ensuring the emission plane of the device under test is co-linear with the sphere s sensor baffle. The sample is powered using a Chroma 61503 AC Power Source and a Xitron 2801 Power Analyzer is used to measure power. Figure 4: Sample in 2m Integrating Sphere ³ IES LM-79-08, Electrical and Photometric Measurements of Solid State Lighting Products 7 of 41
Tests Date Ambient Temp. ( C) Input Voltage (Volts AC) Frequency (Hz) Luminous Flux, Radiant Flux, Chromaticity, Color Rendering, Spectral Power Distribution, Luminaire Efficacy 01-Mar-12 22 231 50 Table 2: Photometric Test Conditions 8 of 41
Luminous Flux, Radiant Flux Radiant flux is a measure of the total power of electromagnetic radiation emitted from the luminaire or lamp, while luminous flux is a measurement that is weighted based on human visual perception and measured results are presented in Table 3. Measurements are recorded once per minute over a sufficient period of time to allow the sample to reach thermal equilibrium. In the case of this luminaire, it took approximately 1.5 hours to stabilize as shown in Chart 1. Parameter Stable Data Radiant Flux (Watts) 49.42 Photopic luminous flux (lumens) 15689 Table 3: Luminaire Radiometric and Photometric Output Chart 1: Luminous Flux Plotted Versus Time 9 of 41
Luminaire Chromaticity and Color Rendering Parameter Stable Data x coordinate 0.3393 y coordinate 0.3525 u' coordinate 0.2071 v' coordinate 0.4843 Correlated Color Temperature 5226 Delta uv 0.0028 Table 4: Measured Chromaticity and Correlated Color Temperature (CCT) Data Chart 2: Plot of x-y Coordinates on ANSI C78.377A Diagram 10 of 41
Chart 3: Correlated Color Temperature vs. Time Color Rendering Index (CRI) Value Average (RA) 81 CRI (R1) 79 CRI (R2) 88 CRI (R3) 91 CRI (R4) 78 CRI (R5) 79 CRI (R6) 81 CRI (R7) 87 CRI (R8) 67 CRI (R9) 6 CRI (R10) 68 CRI (R11) 75 CRI (R12) 55 CRI (R13) 82 CRI (R14) 95 Table 5: Measured Color Rendering Index 11 of 41
Luminaire Spectral Distribution Parameter Stable Data Peak Wavelength (nm) 456 Dominant Wavelength (nm) 565 Table 6: Peak and Dominant Wavelength Chart 4: Measured Spectral Power Distribution 12 of 41
nm mw/nm nm mw/nm nm mw/nm nm mw/nm 380 1.0 490 101.2 600 228.1 710 26.7 385 0.9 495 103.3 605 219.8 715 23.3 390 0.6 500 114.8 610 209.4 720 20.3 395 0.9 505 133.9 615 199.7 725 17.6 400 0.8 510 156.2 620 188.6 730 15.2 405 1.2 515 177.1 625 176.3 735 13.2 410 2.6 520 196.0 630 164.1 740 11.4 415 6.0 525 210.5 635 151.4 745 9.8 420 14.1 530 221.9 640 139.2 750 8.5 425 30.3 535 229.5 645 127.9 755 7.4 430 57.3 540 234.7 650 116.3 760 6.4 435 95.0 545 239.6 655 105.2 765 5.5 440 143.8 550 242.8 660 94.6 770 4.8 445 216.6 555 244.7 665 84.6 775 4.2 450 322.0 560 247.3 670 75.0 780 3.6 455 395.3 565 248.1 675 66.7 460 353.8 570 248.4 680 59.0 465 262.8 575 247.8 685 52.1 470 203.7 580 246.4 690 45.8 475 163.4 585 244.3 695 40.0 480 128.4 590 240.7 700 35.1 485 107.8 595 235.5 705 30.6 Overall Luminaire Efficacy Table 7: SPD Numerical Data The overall luminaire efficacy, also referred to as wall plug efficiency, is a metric of how well the luminaire or lamp converts electrical energy into photons. The input power was measured at an input voltage of 230VAC. Efficacy (At steady state) = Lumens / Total input Power = 15689 /193.7 = 81 lm/w 13 of 41
Component Binning and Color Point Evaluation A total of 10 LEDs were measured at the binning current of 700 ma. Based on the measured data, the lamps are from the T5 (260 lm min. +/-7%) flux bin and 3B chromaticity bin. Chart 5: Measured Data Plotted on Cree Binning Chart Board/Lamp CCx CCy Lum Flux 6 0.3460 0.3593 276.40 7 0.3437 0.3572 270.88 8 0.3450 0.3591 273.70 9 0.3438 0.3580 263.27 10 0.3441 0.3611 269.54 11 0.3447 0.3571 274.72 12 0.3442 0.3559 272.78 13 0.3451 0.3580 275.84 14 0.3428 0.3561 269.57 15 0.3437 0.3581 266.48 Table 8: Measured Component Data 14 of 41
Illuminance The sample was measured on a type C goniophotometer as shown in Figure 5 and illuminance measurements were calculated from the IES-63 electronic file using Photometrics Pro software. The results of the calculations are shown in Charts 6 and 7. Figure 5: Sample Mounted on Type C Goniophotometer Chart 6: Cone of Light Diagram 15 of 41
Chart 7: Isofootcandle Plot 16 of 41
Optical Efficiency Calculation The optical system for this luminaire consists of a glass cover and two different types of individual lens that fits over each LED as shown in Figure 6. The sample was tested with and without optics and the results are shown below in Table 9. Using this data, the optical efficiency can be calculated. The initial lumen values were used to avoid any effects due to thermal differences with the optics removed. Figure 6: Optical Components Condition Radiant Flux (Watts) Luminous Flux (lumens) % Loss (overall) With Optics 51.7 16756 9.9% Glass Removed 54.9 17884 3.8% No Optics 57.1 18599 -- Table 9: Measured Optical Efficiency Optical Efficiency = lumens with optic / lumens without = 16756/18599 = 90.1% 17 of 41
Electrical Testing Driver Efficiency Driver efficiency is calculated by dividing the electrical output power supplied to the LEDs by the total input power to the luminaire or lamp. The output power to the LEDs is the sum of the product of the forward voltage and current for each LED. The input power was measured at an input voltage of 230VAC. Driver Efficiency = LED power / Total input power Driver Efficiency = (Vf*If) / Pin Driver Efficiency =(26.7 * 6.526 ) / 198.2 Driver Efficiency =87.9 % Power Factor and Harmonic Distortion Power factor is an important metric for LED driver performance, and in the case of street lighting, utility companies may require that luminaires have power factor greater than some specified value. In general the closer the value is to 1, the better the performance. For this luminaire, the power factor is 0.948. Total harmonic distortion (THD) is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. Harmonic currents are a concern because they can produce problems such as noise interference and overheating of electrical distribution system wiring. The total current harmonic distortion (athd) was measured to be less than 10%. Figure 7: Picture of LED driver 18 of 41