Cree® XLamp® XT-E LED PAR38 Reference Design Table of contents Introduction Introduction..................................................................................... 1 This application note details the design of a 150-watt equivalent Design approach/objectives.......................................................... 2 PAR38 replacement lamp using Cree’s XLamp® XT-E LED. The The 6-step methodology................................................................. 2 XT-E offers industry-leading performance and reduces system 1. Define lighting requirements................................................. 2 2. Define design goals............................................................... 4 3. Estimate efficiencies of the optical, thermal & electrical systems.................................................................................. 5 4. Calculate the number of LEDs needed................................. 7 5. Consider all design possibilities........................................... 7 6. Complete the final steps....................................................... 8 www.cree.com/Xlamp Conclusions................................................................................... 15 CLD-AP94 rev 0C Application Note cost. Parabolic aluminized reflector (PAR) lamps are widely used in various indoor and outdoor applications, from residential and commercial recessed downlights, indoor retail spotlights and outdoor security lighting to stage lights, emergency-vehicle lighting and locomotive headlights. The high flux and efficacy offered by the XLamp XT-E LED make it a particularly strong candidate for use in a PAR38 lamp. Reliance on any of the information provided in this Application Note is at the user’s sole risk. Cree and its affiliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any LED-based lamp or luminaire made in accordance with this reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of Cree or a third party. Luminaire manufacturers who base product designs in whole or part on any Cree Application Note or Reference Design are solely responsible for the compliance of their products with all applicable laws and industry requirements. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. Cree, Inc. 4600 Silicon Drive Durham, NC 27703 USA Tel: +1.919.313.5300 1 XLamp ® XT-E LED PAR38 Reference Design Design approach/objectives In the “LED Luminaire Design Guide”, Cree advocates a 6-step framework for creating LED luminaires. All Cree reference designs use this framework, and the design guide’s summary table is reproduced below. Table 1: Cree 6-step framework Step Explanation 1. Define lighting requirements • The design goals can be based either on an existing fixture or on the application’s lighting requirements. 2. Define design goals • • Specify design goals, which will be based on the application’s lighting requirements. Specify any other goals that will influence the design, such as special optical or environmental requirements. 3. Estimate efficiencies of the optical, thermal & electrical systems • • • Design goals will place constraints on the optical, thermal and electrical systems. Good estimations of efficiencies of each system can be made based on these constraints. The combination of lighting goals and system efficiencies will drive the number of LEDs needed in the luminaire. 4. Calculate the number of LEDs needed • Based on the design goals and estimated losses, the designer can calculate the number of LEDs to meet the design goals. 5. Consider all design possibilities and choose the best • • With any design, there are many ways to achieve the goals. LED lighting is a new field; assumptions that work for conventional lighting sources may not apply. 6. Complete final steps • • • • • Complete circuit board layout. Test design choices by building a prototype luminaire. Make sure the design achieves all the design goals. Use the prototype to further refine the luminaire design. Record observations and ideas for improvement. The 6-step methodology The goal of the design is an LED-based PAR38 lamp that shows the performance available from the XLamp XT-E LED. 1. Define lighting requirements Table 2 shows a ranked list of desirable characteristics to address in a PAR38 lamp reference design. Table 2: Ranked design criteria for PAR38 lamp Importance Critical Characteristics Metric Light intensity - center beam candle power (CBCP) candelas (cd) Illuminance footcandles (fc) / lux (lx) Beam angle - full width half maximum (FWHM) degrees (°) Luminous flux lumens (lm) Efficacy lumens per watt (lm/W) Color uniformity Form factor Important Price $ Lifetime hours Operating temperatures °C Operating humidity % relative humidity Correlated color temperature (CCT) K Color rendering index (CRI) 100-point scale Manufacturability Ease of installation Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 2 XLamp ® XT-E LED PAR38 Reference Design Table 3 summarizes the ENERGY STAR® requirements for all integral LED lamps.1 Table 3: ENERGY STAR requirements for all integral LED lamps Characteristic Requirements Lamp must have one of the following designated CCTs (per ANSI C78.377-2008) consistent with the 7-step chromaticity quadrangles and Duv tolerances below. CCT and Duv Color maintenance Nominal CCT Target CCT (K) and Tolerance 2700 K 3000 K 3500 K 4000 K 2725 ± 145 3045 ± 175 3465 ± 245 3985 ± 275 Target Duv and Tolerance 0.000 ± 0.000 ± 0.000 ± 0.001 ± 0.006 0.006 0.006 0.006 The change of chromaticity over the minimum lumen maintenance test period (6,000 hours) shall be within 0.007 on the CIE 1976 (u’, v’) diagram. CRI Minimum CRI (Ra) of 80. R9 value must be greater than 0. Allowable lamp bases Must be a lamp base listed by ANSI. Power factor Lamp power < 5 W and low voltage lamps: no minimum power factor is required Lamp power > 5 W: power factor must be > 0.70 Note: Power factor must be measured at rated voltage. Minimum operating temperature -20 °C or below LED operating frequency ≥ 120 Hz Note: This performance characteristic addresses problems with visible flicker due to low frequency operation and applies to steadystate as well as dimmed operation. Dimming operation shall meet the requirement at all light output levels. Electromagnetic and radio frequency interference Must meet appropriate FCC requirements for consumer use (FCC 47 CFR Part 15) Audible noise Class A sound rating Transient protection Power supply shall comply with IEEE C62.41-1991, Class A operation. The line transient shall consist of seven strikes of a 100 kHz ring wave, 2.5 kV level, for both common mode and differential mode. Operating voltage Lamp shall operate at rated nominal voltage of 120, 240 or 277 VAC, or at 12 or 24 VAC or VDC. Table 4 summarizes the ENERGY STAR requirements for replacement PAR lamps.2 Table 4: ENERGY STAR requirements for PAR lamps Criteria Item Requirements Definition Directional lamp means a lamp having at least 80% light output within a solid angle of ∏ sr (corresponding to a cone with angle of 120°) Minimum luminous efficacy Lamp diameter < 20/8 inch: 40 lm/W Lamp diameter > 20/8 inch: 45 lm/W Color spatial uniformity The variation of chromaticity within the beam angle shall be within 0.006 from the weighted average point on the CIE 1976 (u’, v’) diagram. Maximum lamp diameter Not to exceed target lamp diameter Maximum overall length (MOL) Not to exceed MOL for target lamp Minimum center beam intensity PAR and MR16 lamps PAR lamps Link to online tool at www.energystar.gov/ia/products/lighting/iledl/IntLampCenterBeamTool.zip Lumen maintenance > 70% lumen maintenance (L70) at 25,000 hours of operation Rapid-cycle stress test Cycle times must be 2 minutes on, 2 minutes off. Lamp will be cycled once for every 2 hours of L70 life. As shown in Figure 1, we used the ENERGY STAR Center Beam Intensity Benchmark Tool to determine that a 150-W equivalent PAR38 lamp with a 15° beam angle needs to provide CBCP of 15,761 cd. 1 2 ENERGY STAR Program Requirements for Integral LED Lamps Eligibility Criteria – Version 1.4, Table 4, Ibid., Table 7C Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 3 XLamp ® XT-E LED PAR38 Reference Design ENERGY STAR® Integral LED Lamp Center Beam Intensity Benchmark Tool PAR Lamps Target Incandescent/Halogen Lamp Parameters Enter PAR type/value: Enter Nominal Lamp Wattage: Enter Nominal Beam Angle*: Minimum Center Beam Intensity: 38 150 15 lamp diameter in ⅛ of inch watts degrees 15761 cd Coefficient PAR Type Nominal Wattage Beam Angle Intercept 5.5102112 38 150 15 PAR 0.1395448 Watts 0.0448725 Beam Angle -0.088493 PAR*Watts -0.000521 PAR*Beam Angle -0.000719 Term PAR2 -0.001192 Watts2 -0.00005981 Beam Angle2 Root Mean Square Error Log CBCP Predicted Log Two-sigma CBCP Lower Bound 9.968 9.665 Predicted CBCP CBCP Two-sigma Lower Bound 21324 15761 0.0008786 0.151113 *Nominal beam angle per ANSI C78.379-2006: American National Standard for electric lamps-- Classification of the Beam Patterns of Reflector Lamps. See Section 4.1 Nominal beam angle classifications, and section 4.3 Beam angle tolerance of PAR and R lamps. Figure 1: ENERGY STAR Center Beam Intensity Benchmark Tool output for 150-W equivalent PAR38 lamp with 15° beam angle To demonstrate the capability and flexibility of the XT-E LED, we made two additional versions of the PAR38 lamp, with 18° and 35° beam angles. We used the ENERGY STAR Center Beam Intensity Benchmark Tool to determine that an 18° beam angle lamp needs to provide CBCP of 12,147 cd and a 35° beam angle lamp needs to provide CBCP of 3,743 cd. 2. Define design goals Table 5 shows the design goals for this project. Table 5: XT-E PAR38 lamp design goals Characteristic Unit Minimum Goal Target Goal Light output lm 1,600 > 1,600 CBCP - 15° beam angle cd 15,761 16,000 CBCP - 18° beam angle cd 12,147 12,500 4,000 CBCP - 35° beam angle cd 3,743 lm/W 54 60 W 30 < 30 CCT K 3,000 3,000 CRI 100-point scale 75 80 % 90 > 90 Efficacy Power Power factor Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 4 XLamp ® XT-E LED PAR38 Reference Design 3. Estimate efficiencies of the optical, thermal & electrical systems LED Comparison We used Cree’s Product Characterization Tool (PCT) tool to determine the drive current for the design. ForSystem the 1,600-lumen target, we Report estimated 90% optical efficiency and 85% driver efficiency. We also estimated a solder point temperature of 75 °C. 1 System: 1,600 Target Lumens : 90% Optical Efficiency: Current (A) LED 1 Model Flux LED 2 Model Cree XLamp XT-E {AWT} Q4 [100] $ Price SYS # LED SYS lm tot Tsp (ºC) 75 Flux Price SYS W (none) Tj (ºC) $ 25 - SYS lm/W 0.100 55 1620.8 17.35 93.4 #N/A #N/A #N/A #N/A 0.150 38 1625 18.26 89 #N/A #N/A #N/A #N/A 0.200 29 1611.3 18.84 85.5 #N/A #N/A #N/A #N/A 0.250 24 1628.8 19.74 82.5 #N/A #N/A #N/A #N/A 0.300 21 1674.1 20.98 79.8 #N/A #N/A #N/A #N/A 0.350 18 1640 21.22 77.3 #N/A #N/A #N/A #N/A 0.400 16 1633.1 21.78 75 #N/A #N/A #N/A #N/A 0.450 15 1689.2 23.2 72.8 #N/A #N/A #N/A #N/A 0.500 14 1718.6 24.28 70.8 #N/A #N/A #N/A #N/A 0.550 13 1722.9 25.01 68.9 #N/A #N/A #N/A #N/A 0.600 12 1703.2 25.39 67.1 #N/A #N/A #N/A #N/A 0.650 11 1660.9 25.41 65.4 #N/A #N/A #N/A #N/A 0.700 11 1756.5 27.56 63.7 #N/A #N/A #N/A #N/A 0.750 10 1681 27.03 62.2 #N/A #N/A #N/A #N/A 0.800 10 1761.9 29.01 60.7 #N/A #N/A #N/A #N/A 0.850 2: PCT9view of the number 1656.3 of LEDs 27.92 #N/A #N/A #N/A #N/A Figure used and 59.3 drive current 0.900 9 1724.1 29.73 58 #N/A #N/A #N/A #N/A 0.950 9 1789.6 31.56 56.7 #N/A #N/A #N/A #N/A The PCT shows that, at 600 mA, 12 XT-E LEDs provide sufficient light output to meet the design goals. 1.000 8 1647.2 29.7 55.5 #N/A #N/A #N/A #N/A 1.100 8 1755.4 33.02 53.2 #N/A #N/A #N/A #N/A Thermal Requirements 1.200 7 1624.8 31.85 51 #N/A #N/A #N/A #N/A For the PAR38 lamp in this reference design to use 1709.2 a commercially Edison screw housing #N/A 1.300we decided 7 34.87available 49 housing with an #N/A #N/Abase. The #N/A 1.400 7 1790.2 ring. 37.97 47.1 #N/Aavailable#N/A 3 We also decided to use a#N/A commercially heat sink, #N/A is part of a kit, shown in Figure 3, that includes a plastic optic-locking 1.500 6 1601.2 35.28 45.4 #N/A #N/A #N/A #N/A shown in Figure 4, to dissipate the thermal load.4 1.600 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 1.700 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 1.800 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 1.900 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 2.000 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sh Copyright © 2009-2011 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and 3 4 PAR38 housing module, LedLink Optics, Inc. Ibid., Model PAR38 Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 5 XLamp ® XT-E LED PAR38 Reference Design Figure 3: Housing kit components Figure 4: Heat sink We performed thermal simulations to verify this thermal design is sufficient. Figure 5 shows the thermal simulation results for the design. The simulated solder point temperature (TSP) is 75 °C. Figure 5: Thermal simulation of XT-E PAR38 lamp Driver The driver for this PAR38 lamp must be located inside the lamp housing. We decided to use a market-ready constant-current driver that fits within the PAR38 form factor and matches the design’s current and voltage range.5 5 Model TXM11-T0702-TT, TXM Power Co. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 6 XLamp ® XT-E LED PAR38 Reference Design Figure 6: XT-E PAR38 driver Secondary Optics PAR38 lamps are commonly used as both spotlights and floodlights and are offered with a variety of beam angles. This XT-E PAR38 design addresses lamps with 15°, 18°, and 35° beam angles, each using a 12-in-1 lens optic, shown in Figure 7.6 The optic is only design difference in the lamps. Figure 7: Both sides of XT-E PAR38 optic 4. Calculate the number of LEDs needed Using Cree’s PCT, we determined that 12 XLamp XT-E LEDs produce sufficient light to meet the 1,600-lm design goal. 5. Consider all design possibilities There are many ways to design an LED-based PAR38 lamp. This reference design aims to show that the XT-E LED enables a PAR38 lamp offering superior performance. The XT-E LED offers a wide range of color temperatures. As highlighted in Table 6, we selected a warm white LED for this PAR38 lamp design. By selecting an LED from a low-level flux bin, we ensured that this design meets its goals using an LED that is readily available. 6 LedLink Optics, Inc. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 7 XLamp ® XT-E LED PAR38 Reference Design Table 6: XT-E order codes CCT Range Color Min. Warm White 2,600 K Base Order Codes Minimum Luminous Flux @ 350 mA (lm) Max. 3,700 K Order Code Group Flux (lm) Q5 107 XTEAWT-00-0000-00000LDE7 Q4 100 XTEAWT-00-0000-00000LCE7 Q3 93.9 XTEAWT-00-0000-00000LBE7 6. Complete the final steps Using the methodology described above, we determined a suitable combination of LEDs, components and drive conditions for a PAR38 lamp. This section describes how Cree assembled the lamp and shows the results of the design. Prototyping Details 1. We verified the component dimensions to ensure a correct fit. 2. Following the recommendations in Cree’s Soldering and Handling Application Note for the XT-E LED, with an appropriate solder paste and reflow profile, we reflow soldered the LEDs to the metal core printed circuit board (MCPCB). 3. We soldered the input wires to the MCPCB. 4. We tested the connection by applying power to the LEDs and verified the LEDs lit up. 5. We applied a thin layer of thermal conductive compound to the back of MCPCB and attached it to the heat sink with screws. 6. We soldered the LED DC input wires to the driver DC output wires. 7. We fit the LED driver into the housing and secured it with screws. 8. We screwed the housing to the heat sink. 9. We placed the optic on the LED MCPCB, aligning the positioning tabs, and secured it to the heat sink with the plastic locking ring. 10. We performed final testing. Results Thermal Results Cree verified the board temperature with a thermocouple to confirm that the thermal dissipation performance of the heat sink aligns with our simulation. As shown in Figure 8, the measured solder point temperature was 78 °C, which is in close agreement with the simulation and shows that the heat sink is sufficient for this design. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 8 XLamp ® XT-E LED PAR38 Reference Design TSP Solder Point Temperature T2 Heat Sink Temperature T3 PCB Temperature 78 °C 62 °C 66 °C Figure 8: Thermal measurement Based on the measured solder point temperature of 78 °C, the junction temperature (TJ) can be calculated as follows. TJ= TSP + (LED power * LED thermal resistance) TJ = 78 °C + (2 W * 5 °C/W) TJ = 88 °C Estimated LED Lifetime Since the XLamp XT-E LED is a new component, based on our experience with similar LED systems, we expect the lumen maintenance performance of the XT-E LED to be at least as good as that of the XLamp XP-E High Efficiency White (HEW) LED. Figure 9 shows the calculated and reported lifetimes, determined using the TM-21 projection algorithm, for the XP-E HEW LED at a 700mA input current at three solder point temperatures. The duration of Cree’s XP-E HEW LM-80 data set is 6,000 hours at a 700-mA drive current. The TM-21 methodology limits the projection to six times the duration of the LM-80 data set. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 9 XLamp XT-E LED PAR38 Reference Design TM-21 Lifetime Report ® LED I Data Set Tsp Sample Size Test Duration α β Calculated Lifetime Reported Lifetime 1 45°C 25 6,048 hrs 4.302E-06 1.024E+00 L70(6k) = 88,500 hours L70(6k) > 36,300 hours XLamp XP-E High Eff. White 700 mA 2 55°C 25 6,048 hrs 5.332E-06 1.011E+00 L70(6k) = 68,900 hours L70(6k) > 36,300 hours 3 85°C 25 6,048 hrs 7.913E-06 1.015E+00 L70(6k) = 47,000 hours L70(6k) > 36,300 hours Reported L Calculated Reported L 110 105 100 95 % Luminous Flux 90 85 45°C (LM-80) 80 55°C (LM-80) 85°C (LM-80) 75 45°C (TM-21) 70 55°C (TM-21) 65 85°C (TM-21) 60 55 50 1,000 10,000 100,000 Time (hours) Figure 9: XP-E HEW TM-21 data This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. Copyright © 2011 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and XLamp are registered trademarks of Cree, Inc. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 10 XLamp ® XT-E LED PAR38 Reference Design TM-21 Lifetime Report Figure 10 shows the calculated and reported lifetimes for the XP-E HEW LED, interpolated from the data shown in Figure 9, at the measured 78 °C TSP for the XT-E LED in this design. With a reported L70(6k) lifetime greater than 36,300 hours and a calculated L70(6k) lifetime of 51,500 hours, we expect the lamp to easily meet the ENERGY STAR lumen maintenance requirement, > L70 at 25,000 hours.7 Ts1 XLamp XP-E High Eff. White 700 mA Tsi (Interpolated) Ts2 55°C 78°C 85°C 328.15 K 350.15 K 1546.25 5.9337E-04 7.170E-06 1.013E+00 L70(6k) = 51,500 hours L70(6k) > 36,300 hours L70(6k) = 51,500 hours L70(6k) > 36,300 hours 358.15 K LED I Tsp Tsp Ea/kB A α β Calculated L70 Reported L70 Calculated Lifetime Reported Lifetime 5.332E-06 1.011E+00 L70(6k) = 68,900 hours L70(6k) > 36,300 hours 7.913E-06 1.015E+00 L70(6k) = 47,000 hours L70(6k) > 36,300 hours 110 45°C (LM-80) 105 55°C (LM-80) 100 85°C (LM-80) 95 45°C (TM-21) 55°C (TM-21) % Luminous Flux 90 85°C (TM-21) 85 78°C (LM-80) 80 75 L70: 51,500hrs 70 65 60 55 50 1,000 10,000 100,000 Time (hours) Figure 10: XP-E HEW TM-21 data with TSP = 78 °C 7 Thisis,document is hours provided for informational and70% is not warranty or aflux. specification. For product specifications, please see the That after 25,000 of operation, the LED willpurposes still deliveronly at least of itsa initial luminous data sheets available at www.cree.com. Copyright © 2011 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and ® ® Copyright © 2012-2016 Cree, Inc. Alltrademarks rights reserved. information XLamp are registered ofThe Cree, Inc. in this document is subject to change without notice. Cree and XLamp are registered trademarks and the Cree logo is a trademark ® of Cree, Inc. ENERGY STAR is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 11 XLamp ® XT-E LED PAR38 Reference Design Optical and Electrical Results We obtained the results in Table 7 and Table 8 by testing the PAR38 lamps in a 1.5-meter sphere after a 60-minute stabilization time.8 As the tables show, the lamps exceed the 1,600-lm target using less than 30 W of power. The lamps also meet their CBCP goals. In addition, the PAR38 lamps meet the ENERGY STAR efficacy, power factor, CCT and CRI requirements. The results in Table 7 are common to the three XT-E PAR38 lamps. Table 7: XT-E PAR38 lamp steady-state results Characteristic Unit Result W 24.5 CCT K 3,093 CRI 100-point scale 82 % 99.2 Power Power factor Current Voltage (total) mA 600 V 38.7 Table 8 shows optical results for the three individual XT-E PAR38 lamps. Table 8: XT-E PAR38 lamp optical results Characteristic Unit Lens model Result GK25 GK40 GK60 14 18 37 Beam angle ° Light output lm 1,679 1,815 1,738 CBCP cd 16,802 12,936 3,903 lm/W 68.5 74 71 Efficacy We also tested the intensity distribution of the PAR38 lamps. Figures 11, 12 and 13 show an even intensity distribution for each beam angle. 8 Testing was performed in a type A goniometer at Cree’s Shenzhen Technology Center. IES files for the PAR38 lamp are available: with GK25 lens, with GK 40 lens, with GK 60 lens. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 12 XLamp ® XT-E LED PAR38 Reference Design Figure 11: Angular luminous intensity distribution of XT-E PAR38 lamp 14° beam angle Figure 12: Angular luminous intensity distribution of XT-E PAR38 lamp 18° beam angle Figure 13: Angular luminous intensity distribution of XT-E PAR38 lamp – 37° beam angle Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 13 XLamp ® XT-E LED PAR38 Reference Design Tables 9, 10 and 11 show the illuminance of the XT-E PAR38 lamps at various distances from the light source. Table 9: XT-E PAR38 illuminance – 14° beam angle Height Illuminance Eavg Emax Eavg Emax Diameter 1m 3.3 ft 1010 fc 1604 fc 10,869 lx 172,631 lx 24.7 cm 0.8 ft 2m 6.6 ft 252.4 fc 401.0 fc 2717 lx 43,161 lx 49.4 cm 1.6 ft 3m 9.8 ft 112.2 fc 178.2 fc 1208 lx 19,181 lx 75.1 cm 2.4 ft 4.m 13.1 ft 63.1 fc 100.2 fc 679 lx 10,791 lx 98.7 cm 3.2 ft 5m 16.4 ft 40.4 fc 64.2 fc 435 lx 691 lx 123.4 cm 4.1 ft Table 10: XT-E PAR38 illuminance – 18° beam angle Height Illuminance Eavg Emax Eavg Emax Diameter 1m 3.3 ft 803.4 fc 1209 fc 8,648 lx 130,081 lx 32.0 cm 1.1 ft 2m 6.6 ft 200.9 fc 302.1 fc 2,162 lx 32,521 lx 64.0 cm 2.1 ft 3m 9.8 ft 89.3 fc 134.3 fc 960.9 lx 14,451 lx 96.1 cm 3.2 ft 4.m 13.1 ft 50.2 fc 75.5 fc 540.5 lx 813.0 lx 128.1 cm 4.2 ft 5m 16.4 ft 32.1 fc 48.3 fc 345.9 lx3 520.3 lx 160.1 cm 5.3 ft Table 11: XT-E PAR38 illuminance – 37° beam angle Height Illuminance Eavg Emax Eavg Emax Diameter 1m 3.3 ft 244.6 fc 349.7 fc 2,633 lx 37,641 lx 58.8 cm 1.9 ft 2m 6.6 ft 61.2 fc 87.4 fc 658.2 lx 941.1 lx 117.6 cm 3.9 ft 3m 9.8 ft 27.2 fc 38.9 fc 292.5 lx 418.3 lx 176.3 cm 5.8 ft 4.m 13.1 ft 15.3 fc 21.9 fc 164.5 lx 235.3 lx 235.1 cm 7.7 ft 5m 16.4 ft 9.8 fc 14.0 fc 105.3 lx3 150.6 lx 293.9 cm 9.6 ft Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 14 XLamp ® XT-E LED PAR38 Reference Design Conclusions This reference design illustrates the superior performance of a PAR38 lamp based on the Cree XLamp XT-E LED. The PAR38 lamp components are all commercially available, showing that an extremely capable lamp can be designed without the time and expense of developing custom parts. Demonstrating the flexibility of the XLamp XT-E LED, we made three excellent PAR38 lamps by changing only the optic. The lighting-class performance of the Cree XLamp XT-E LED makes it an attractive design option for an LED-based PAR38 lamp. Reliance on any of the information provided in this Application Note is at the user’s sole risk. Cree and its affiliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any LED-based lamp or luminaire made in accordance with this reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of Cree or a third party. Luminaire manufacturers who base product designs in whole or part on any Cree Application Note or Reference Design are solely responsible for the compliance of their products with all applicable laws and industry requirements. Copyright © 2012-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]. 15