Cree® XLamp® CXA3050 LED Wall Pack Reference Design Table of Contents Introduction Introduction..................................................................................... 1 Wall‑packs are widely used in environments such as parking Design approach/objectives.......................................................... 2 garages, tunnels, building entrances, walkways and recreational The 6-step methodology................................................................. 2 areas to provide perimeter, accent and security lighting. Wall 1.Define lighting requirements.................................................. 2 packs have traditionally used high‑pressure sodium, metal 2.Define design goals................................................................. 3 halide (MH), or incandescent lamps. 3.Estimate efficiencies of the optical, thermal & electrical systems.................................................................................... 3 4.Calculate the number of LEDs needed................................... 5 5.Consider all design possibilities............................................. 6 6.Complete the final steps......................................................... 6 Other design possibilities............................................................. 15 Conclusions................................................................................... 15 www.cree.com/Xlamp Bill of materials............................................................................. 16 CLD-AP170 rev 0C Application Note This reference design demonstrates the possibility of retrofitting an existing metal halide wall pack with a small number of Cree XLamp® CXA3050 LED integrated arrays to achieve a result that exceeds the original’s light output with improved color rendering, efficiency and energy savings. The high flux output and efficacy offered by the XLamp CXA3050 LED integrated array make it a particularly strong candidate for use in a wall pack. 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 © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Design approach/objectives In the “LED Luminaire Design Guide” application note, 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 in Table 1. 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 for this project was to retrofit an existing fixture to produce a 250‑watt equivalent wall pack using the XLamp CXA3050 LED integrated array. 1. Define lighting requirements Table 2 lists important characteristics to consider in the design of the wall pack in this reference design. Table 2: Ranked design criteria for wall pack Importance Critical Important Characteristics Metric Luminous flux lumens (lm) Electrical power watts (W) Efficacy lm/W Price $ Lifetime hours Operating temperatures °C Correlated color temperature (CCT) K Color rendering index (CRI) 100-point scale Lamp-to-lamp consistency Power factor Manufacturability We gathered the performance data in Table 3 from data sheets available publicly. Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Table 3: Performance data for comparison 250‑W MH wall packs Characteristic Unit Wall Pack A Wall Pack B Light output lm 12,333 12,394 Power W 275 290 lm/W 44.8 42.7 CCT Efficacy K 4057 - CRI 100-point scale 63 - There are currently no ENERGY STAR® requirements for wall packs, however the DesignLights Consortium® provides requirements, summarized in Table 4.1 Table 4: DesignLights Consortium wall pack requirements Outdoor Wall-Mounted Area Luminaires Characteristic Minimum light output 300 lm Zonal lumen density = 100%: 0–90°, < 10% 80-90° Minimum luminaire efficacy 70 lm/W Allowable CCTs (ANSI C78.377-2008) ≤ 5700 K Minimum CRI 65 L70 lumen maintenance 50,000 hours Minimum luminaire warranty 5 years 2. Define design goals Table 5 shows the design goals for this project. We measured the lumen output of the MH lamp to be approximately 20,000 lm with the reflector in the wall pack but without the wall pack’s glass cover and we used this number as goal for the CXA3050 wall pack. Table 5: CXA3050 wall pack design goals Characteristic Light output Luminaire efficacy Unit Minimum Goal Target Goal lm 20,000 > 20,000 lm/W 70 > 70 Power W 285 < 285 CCT K 4000 4000 CRI 100-point scale 80 > 80 3. Estimate efficiencies of the optical, thermal & electrical systems We used Cree’s Product Characterization Tool (PCT) tool to determine the drive current for the design. To match the 20,000‑lumen target, the initial output of the MH lamps in the wall pack without the glass cover, we estimated 100% optical efficiency and 100% driver efficiency.2 We also estimated a case temperature of 75 °C. As highlighted in yellow in Figure 1, the PCT shows that, at 2 A, three XLamp CXA3050 LED integrated arrays provide light output that exceeds the design goal. 1 2 Technical Requirements Table v2.1 We did not expect the wall pack optics and driver to be 100% efficient, but we used this value for our estimates of the conditions to match the lumen output of the MH lamp. Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design LED 1 Current (A) Model Cree XLamp CXA3050 LES 23r {EZW} $ Price SYS # LED SYS lm tot SYS lm/W 1.200 1.300 1.400 1.500 1.600 1.700 1.800 1.900 2.000 2.200 2.400 5 4 4 4 4 4 4 3 3 3 3 Flux X2 [5590] 24173.9 20587 21790.5 22952.4 24075.3 25162 26215.2 20428.3 21174.2 22611.3 23989.1 Tc (ºC) 110.8 107.9 105.1 102.4 99.9 97.5 95.2 93.1 91 87.2 83.7 75 SYS W 218.242 190.882 207.381 224.079 240.968 258.039 275.282 219.518 232.693 259.378 286.482 Figure 1: PCT output with CXA3050 data Thermal Requirements Each of the three XLamp CXA3050 LED integrated arrays in this reference design was attached to an individual extruded aluminum heat sink, shown in Figure 2. The heat sinks were cut at an angle to fit in the housing and so the dimensions of the heat sink assembly serve to position of LEDs within the wall pack housing and no additional mounting hardware was required. The three heat sinks were connected side‑by‑side by a metal bar screwed to the top and bottom edges of the heat sinks, as shown in Figure 3. Figure 2: CXA3050 wall pack heat sink Figure 3: CXA3050 wall pack heat sink assembly Figure 4 shows the results of the thermal simulation of the design. The 75 °C estimated case temperature (Tc) is within the operating limit curve for the CXA3050 LED integrated array.3 3 For additional information on thermal management, refer to the Thermal Management Application Note and the CXA3050 LED Thermal Load Application Note Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Figure 4: CXA3050 wall pack thermal simulation Drive Electronics Cree selected a constant‑current driver, shown in Figure 5. Each XLamp CXA3050 LED integrated array is connected to an individual driver, however, a single driver can be custom made to match the number of LEDs used in a production wall pack. Figure 5: CXA3050 wall pack driver Secondary Optics An optical cavity is a common practice for LED optical design to improve system efficacy. In this design, we replaced the original metal reflector with a white reflective paper, and kept the original glass optic that serves as the front cover of the wall pack. The CX Family LED Design Guide provides basic information on the requirements to use Cree XLamp CXA LEDs successfully in luminaire designs. 4. Calculate the number of LEDs needed The XLamp CXA3050 LED offers a wide range of color temperatures and flux levels. As highlighted in Table 6, we selected a neutral white LED for this wall pack design. Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Table 6: CXA3050 LED order codes Min 70 4000 K Minimum Luminous Flux @ 1400 mA CRI CCT Range 80 90 Typ 75 --- 95 Chromaticity Regions Order Code Group Flux (lm) @ 85 °C Flux (lm) @ 25 °C* W4 5225 5888 X2 5590 6299 X4 6010 6773 CXA3050-0000-000N00X40E5 W2 4860 5477 CXA3050-0000-000N0HW20E5 W4 5225 5888 X2 5590 6299 CXA3050-0000-000N0HX20E5 V2 4230 4767 CXA3050-0000-000N0UV20E5 V4 4545 5122 W2 4860 5477 CXA3050-0000-000N00W40E5 5A0, 5B0, 5C0, 5D0 5A0, 5B0, 5C0, 5D0 5A0, 5B0, 5C0, 5D0 CXA3050-0000-000N00X20E5 CXA3050-0000-000N0HW40E5 CXA3050-0000-000N0UV40E5 CXA3050-0000-000N0UW20E5 5. Consider all design possibilities The basic design of this wall pack is to retrofit an existing wall pack fixture with XLamp CXA3050 LED integrated arrays. We therefore removed the reflector and MH lamp from the fixture and replaced them with the heat sink assembly and the attached LEDs. We opened a slot in the top and bottom of the housing to allow airflow for cooling. The driver is IP‑67 rated, and with the appropriate wiring connections, this prototype wall pack’s construction is similar to that of other fixtures that are exposed to the elements. An O-ring could be added to make a seal between the heat sinks and the housing. To show the capabilities of the CXA3050 LED integrated array, we made two wall packs: one with two LEDs and another with three LEDs. As shown in Figure 6, the two surfaces of the reflector in the MH wall pack direct light normal to the lens opening. The reflection angle of the light from the horizontally mounted MH lamp is the same as angle of the lens opening. The CXA3050’s light emission is lambertian and the heat sink is aligned to match the angle of the lens opening, as shown in Figure 7. The directional light output of the XLamp CXA3050 LED integrated array is an advantage in a wall pack design. Figure 6: MH wall pack light output Figure 7: CXA3050 wall pack light output 6. Complete the final steps This section illustrates the techniques used to retrofit a wall pack with XLamp CXA3050 LED integrated arrays and shows the results of the design. Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Prototyping Details The essence of the design is to replace the internal components of an existing wall pack with the heat sinks and drivers necessary to operate the Cree XLamp CXA3050 LED integrated arrays. The assembly steps are detailed below. 1. We verified the component dimensions to ensure a correct fit. 2. We removed the internal components of the original MH wall pack and cut a slot in the top and bottom of the housing. 3. We screwed a metal bar to the top and bottom edges of the heat sinks to connect the three heat sinks side‑by‑side. 4. We applied a thin layer of thermally conductive compound to the back of the CXA3050 LED integrated arrays and attached the LEDs to the heat sink. Thermal conductive epoxy can also be used. 5. We attached a two‑piece connector to the LED to align the LED and provide for electrical connection. Companies that participate in the Cree Solution Provider Program (CSP) can supply connectors and their websites can be accessed from the Cree website. 6. We fed the LED input wires through the through‑holes in the heat sink and attached the wires to the connectors. 7. We installed reflective paper (with cutouts for the LEDs) over the LEDs. Figure 8 shows the wall pack at this point in the assembly process. Figure 8: CXA3050 LED integrated arrays attached to heat sink 8. We secured the heat sink to the front part of the housing with screws. 9. As shown in Figure 9, we mounted the drivers to the back part of the housing. Figure 9: Drivers connected to housing Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design 10. We connected the output wire of one driver to an individual LED’s input wire, resulting in a one‑to‑one driver‑to‑LED connection. We made the other two driver‑to‑LED connections. 11. We secured the front and back parts of the housing together. 12. We performed final testing. Results Thermal Results Cree verified the case temperature with a thermocouple to confirm that the thermal dissipation performance of the heat sink is sufficient. For the 3‑LED wall pack, we measured a case temperature of 67 °C for the center LED and 65 °C for the other two LEDs, within the operating limit curve for the CXA3050 LED integrated array. LED Lifetime We used the Environmental Protection Agency (EPA ) TM-21 Calculator to determine the calculated and reported lifetimes for the XLamp CXA3050 LED integrated array at a 2-A input current and 67 °C case temperature. The duration of Cree’s CXA3050 LM‑80 data set is 6,048 hours at 85 °C. The TM-21 methodology limits the projection to six times the duration of the data set. With a reported L70(6k) lifetime greater than 36,000 hours and a calculated L70(6k) lifetime of 76,000 hours for the CXA3050 LED integrated array, we expect the CXA3050 wall pack to easily exceed an L70 lifetime of 50,000 hours. The CXA3050 LED integrated array’s calculated and reported L90(6k) lifetimes of 23,000 hours are a significant improvement over the 10,000- to 15,000‑hour lifetimes of a typical MH lamp. Optical and Electrical Results We obtained the results in Table 7 and following by testing the luminaire in a 2-meter sphere and Type C goniophotometer at steady state.4 As the table shows,both CXA3050 wall packs exceed the performance of the comparison wall packs, providing considerably higher light output, CRI and efficacy. Both CXA3050 wall packs also exceed the DLC light output, efficacy and CRI requirements. The 2‑LED CXA3050 wall pack matches the lumen output of the comparison wall packs with a 36% energy savings. The 3‑LED CXA3050 wall pack provides 66% more lumen output using the same power as the comparison wall packs. The DLC requirements specify a wall pack that produces no uplight. The CXA3050 wall packs use the housing and glass optic of wall pack A, and their lumen densities are the same as the original fixture. Table 7: CXA3050 wall pack steady-state results Characteristic Light output Luminaire efficacy Power Unit DesignLights Consortium Wall Pack Requirement Target Goal Wall Pack A Wall Pack B 2‑LED CXA3050 Wall Pack 3‑LED CXA3050 Wall Pack lm 300 20,00 12,333 12,394 13,746 20,454 lm/W 70 lm/W > 70 44.8 42.7 77.9 76.7 W - < 285 275 290 176.5 266.7 76%: 0–90°, 10% 80-90° 81%: 0–90°, 9% 80-90° 77%: 0–90°, 10% 80-90° 76%: 0–90°, 10% 80-90° = 100%: 0–90°, < 10% 80-90° Zonal lumen density CCT K ≤ 5700 K 4000 4057 3950 3990 CRI 100-point scale 65 > 80 63 84 84 4 Testing was performed at Cree’s Durham Technology Center. IES files for the 2‑LED wall pack and the 3-LED wall pack are available. Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Figure 10 shows the polar candela distribution for the comparison wall packs. Wall Pack A Wall Pack B Figure 10: Polar candela distribution for comparison wall packs The polar candela distribution in Figure 11 shows a consistent beam shape and light distribution for the CXA3050 wall packs. 2‑LED CXA3050 Wall Pack 3‑LED CXA3050 Wall Pack Figure 11: Polar candela distribution for CXA3050 wall packs Copyright © 2013-2016 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 ® CXA3050 LED Wall pack Reference Design Table 8 through Table 11 show the simulated illumination of the comparison wall packs and the CXA3050 wall packs. The simulated area is 150 ft X 150 ft (45.7 m X 45.7 m) with the wall packs mounted 15‑ft (4.6‑m) high at the mid‑point of one side of the area. Illuminance values on the ground in front of the wall pack at various ratios of distance to mounting height are shown. Copyright © 2013-2016 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 Operator Telephone Fax e-Mail Exterior Scene 1 / False Color Rendering XLamp ® CXA3050 LED Wall pack Reference Design Table 8: Simulated illumination for comparison wall pack A Wall Pack A Project 1 10 / 25 / 2013 Legend Operator Telephone Fax e-Mail fc 0.00 0 2.50 1.50 5.00 3.00 7.50 4.50 lx 0.00 26.91 53.82 Scene 1 / Ground 1 / Surface 1/ 80.73Exterior 107.64 134.55 Element 161.46 188.37 10.00 6.00 3.72 14.86 3.72 0 2.50 5.00 7.50 12.50 7.50 15.00 9.00 17.50 10.50 20.00 12.00 fc Isolines (E) 215.28 150.00 ft 3.72 3.72 10.00 12.50 15.00 17.50 20.00 fc 100.00 ft Page 10 50.00 ft Page 8 0.00 50.00 ft 0.00 100.00 ft 150.00 ft Ratio of Distance to Mounting Height Ratio of Distance to Mounting Height -4 0 -3 fc lx fc lx fc 0.01 0.11 0.05 0.54 0.21 Position of surface in external scene: Marked point: -2 -1 (0.000 ft, 0.000 ft, 0.000 ft) 0 Values in Footcandles, Scale 1 : 358 1 2 3 4 lx fc lx fc lx fc lx fc lx fc lx fc lx 2.26 0.27 2.91 10.00 107.64 0.27 2.91 0.21 2.26 0.05 0.54 0.01 0.11 1 0.04 0.43 0.11 1.18 0.39 0.51 5.49 5.39 58.02 1.51 16.25 0.39 4.20 0.11 1.18 0.04 0.43 2 0.05 0.54 0.12 1.29 0.27 Grid: 128 x 128 Points 4.20 0.67 7.21 1.52 16.36 0.67 7.21 0.27 2.91 0.12 1.29 0.05 0.54 3 0.05 0.54 0.09 0.97 0.19 2.05 0.26 0.37 3.98 3.98 0.018 0.19 2.05 0.97 0.05 0.54 4 0.04 0.43 0.07 0.75 0.12 1.29 2.15 2.15 1.29 0.07 0.75 0.04 0.43 2.91 E av [fc] 0.20 E min [fc] 0.60 0.00 0.27 6.46 E max [fc] 0.37 16 2.91 0.20 u0 0.12 E min / E max 0.09 0.000 Copyright © 2013-2016 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 Page 9 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 Project 1 10 / 25 / 2013 Operator Telephone Fax e-Mail XLamp ® CXA3050 LED Wall pack Reference Design Exterior Scene 1 / False Color Rendering Table 9: Simulated illumination for comparison wall pack B Wall Pack B Project 1 10 / 25 / 2013 Legend Operator Telephone Fax e-Mail fc 0.00 0 2.50 1.50 5.00 3.00 7.50 4.50 lx 0.00 26.91 53.82 Scene 1 / Ground 1 / Surface188.37 1/ 80.73Exterior107.64 134.55Element 161.46 10.00 6.00 3.72 1.86 5.57 7.43 1.86 0 2.50 5.00 3.72 12.50 7.50 15.00 9.00 17.50 10.50 20.00 12.00 fc Isolines 215.28 (E) 150.00 ft 1.86 3.72 1.86 7.50 1.86 10.00 1.86 1.86 1.86 12.50 15.00 17.50 20.00 fc 100.00 ft Page 10 Page 8 50.00 ft 0.00 50.00 ft 0.00 100.00 ft 150.00 ft Ratio of Distance to Mounting Height -4 Ratio of Distance to Mounting Height fc -3 lx fc lx fc Position of surface in external scene: Marked -2 point: -1 (0.000 ft, 0.000 ft, 0.000 ft) lx fc lx 0 fc Values in Footcandles, Scale 1 : 358 1 lx fc 2 lx fc 3 lx fc 4 lx fc lx 0 0.01 0.11 0.04 0.43 0.15 1.61 1.17 12.59 8.13 87.51 1.17 12.59 0.15 1.61 0.04 0.43 0.01 0.11 1 0.04 0.43 0.12 1.29 0.52 5.60 2.40 25.83 5.49 59.09 2.40 25.83 0.52 5.60 0.12 1.29 0.04 0.43 2 0.05 0.54 0.15 1.61 x 128 Points 0.48Grid: 128 5.17 1.17 12.59 1.50 16.15 1.17 12.59 3 0.05 0.54 0.13 1.40 0.24 2.580.30 0.41 4.41 0.01 0.47 5.06 4 0.05 0.54 0.09 0.97 0.14 1.51 1.94 1.94 E av [fc] 0.18 E min [fc] 0.18 E max [fc] 0.41 9.28 0.18 0.48 5.17 0.15 1.61 0.05 0.54 4.410.018 0.24 2.58 E min / E max 0.13 0.001 1.40 0.05 0.54 1.94 1.51 0.09 0.97 0.05 0.54 u0 0.14 Pageand 9 Copyright © 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks 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 Project 1 10 / 28 / 2013 Operator Telephone Fax e-Mail ® XLamp CXA3050 LED Wall pack Reference Design Exterior Scene 1 / False Color Rendering Table 10: Simulated illumination for 2‑LED CXA3050 wall pack 2-LED CXA3050 Wall Pack Project 1 10 / 28 / 2013 Legend fc 0.00 0 lx 2.50 1.50 0.00 26.91 5.00 3.00 7.50 4.50 53.82 Scene 1 / Ground 1 / Surface 1/ 80.73Exterior 107.64 134.55 Element 161.46 188.37 10.00 6.00 2.79 0 Operator Telephone Fax e-Mail 2.50 5.00 12.50 7.50 15.00 9.00 17.50 10.50 fc Isolines (E) 215.28 150.00 ft 8.36 5.57 5.57 2.79 2.79 5.57 2.79 2.79 2.79 2.79 7.50 20.00 12.00 10.00 12.50 15.00 17.50 20.00 fc 100.00 ft Page 10 Page 8 50.00 ft 0.00 50.00 ft 0.00 100.00 ft 150.00 ft Ratio of Distance to Mounting Height Ratio of Distance to Mounting Height -4 -3 Position of surface in external scene: -2 point: -1 Marked (0.000 ft, 0.000 ft, 0.000 ft) 0 Values in Footcandles, Scale 1 : 358 1 2 fc lx fc lx fc 0 0.01 0.11 0.07 0.75 1 0.05 0.54 0.15 1.61 2 0.07 0.75 0.17 1.83 x 128 Points 0.32Grid: 128 3.44 0.59 3 0.07 0.75 0.11 1.18 0.19 E av [fc] 2.05 0.31 E min [fc] 3.34 0.38 4 0.05 0.54 0.08 0.86 0.12 1.29 2.05 2.15 1.83 3 fc lx fc lx fc lx fc 0.26 2.80 2.42 26.05 9.51 102.36 2.29 24.65 0.26 2.80 0.07 0.75 0.02 0.22 0.72 7.75 2.48 26.69 5.49 59.09 2.56 27.56 0.7 7.53 0.17 1.83 0.05 0.54 6.35 0.82 8.83 0.59 6.35 0.38 4.09 0.16 1.72 0.07 0.75 4.09 E max [fc] 0.30 3.23 u0 0.17 0.024 1.83 E min / E max 0.12 1.29 0.001 0.06 0.65 0.05 0.54 0.29 0.19 0.01 0.20 13 0.17 0.12 lx 1.29 fc 4 lx 0.07 lx 0.75 fc lx Copyright © 2013-2016 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 Page 9respective owners and do not 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 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 Project 1 10 / 25 / 2013 Operator ® Telephone Fax e-Mail XLamp CXA3050 LED Wall pack Reference Design Exterior Scene 1 / False Color Rendering Table 11: Simulated illumination for 3‑LED CXA3050 wall pack 3-LED CXA3050 Wall Pack Project 1 10 / 25 / 2013 Legend Operator Telephone Fax e-Mail fc 0.00 0 2.50 1.50 5.00 3.00 7.50 4.50 lx 0.00 26.91 53.82 80.73 Exterior 107.64 161.46 188.37 Scene 1 / 134.55 Ground Element 1 / Surface 1/ 10.00 6.00 4.64 0 2.50 12.50 7.50 17.50 10.50 20.00 12.00 fc 215.28 Isolines (E) 150.00 ft 9.29 9.29 4.64 4.64 9.29 7.50 10.00 4.64 12.50 4.64 4.64 5.00 15.00 9.00 15.00 17.50 20.00 fc 100.00 ft Page 10 Page 8 50.00 ft 0.00 50.00 ft 0.00 100.00 ft 150.00 ft Ratio of Distance to Mounting Height Ratio of Distance to Mounting Height -4 0 Position of surface in external scene: -3 Marked point: -2 -1 (0.000 ft, 0.000 ft, 0.000 ft) 0 Values in Footcandles, Scale 1 : 358 1 2 3 4 fc lx fc lx fc lx fc lx fc lx fc lx fc lx fc lx fc lx 0.03 0.32 0.11 1.18 0.37 3.98 3.16 34.01 15.00 161.46 3.03 32.61 0.39 4.20 0.11 1.18 0.03 0.32 9.80 1 0.08 0.86 0.22 2.37 0.91 3.56 34.01 9.42 101.40 3.63 39.07 0.88 9.47 0.22 2.37 0.08 0.86 2 0.08 0.86 0.21 2.26 128 x 128 Points 0.43 Grid:4.63 0.87 38.32 1.37 14.75 0.91 9.80 0.52 5.60 0.20 2.15 0.08 0.86 E [fc] 9.36 min0.010.65 E [fc] 7.00 max 210.44 u0 4.74 0.029 0.25 2.69 1.61 0.08 0.86 4.95 3.77 2.91 0.18 1.94 1.08 0.07 0.75 3 0.08 0.86 0.14 1.51 0.28 E [fc] 3.01 av0.430.46 4 0.06 0.65 0.12 1.29 0.18 1.94 0.27 0.35 0.27 E min / E max 0.15 0.001 0.10 Copyright © 2013-2016 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 9 respective owners and do not 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 ofPage their 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 ® CXA3050 LED Wall pack Reference Design Other design possibilities This reference design demonstrates a retrofit wall pack design based on an existing product. Other designs are possible to fulfill application‑specific requirements, such as the following: • A custom heat sink with an O‑ring can be made to seal the housing and glass cover from the environment. • The drivers can be housed separately and relocated to the back of the fixture. • A tilting feature can be added to adjust the distribution pattern and achieve a cut-off requirement. The pictures in Figure 12 are examples of other wall pack reference designs. Figure 12: Example wall pack design Conclusions This reference design illustrates the excellent performance of a wall pack based on the Cree XLamp CXA3050 LED integrated array. The light output and efficacy of the CXA3050 LED integrated array enable a wall pack with excellent light output and color consistency without metal halide’s slow start-up and restrike times and ultraviolet light. With color temperatures from 2700 K to 5000 K and lumen output up to Copyright © 2013-2016 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 XLamp ® CXA3050 LED Wall pack Reference Design 9,000 lm, the CXA3050 LED integrated array offers the possibility of a product line of wall packs based on a single XLamp LED component. The lighting‑class performance of the Cree XLamp CXA3050 LED integrated array makes it an attractive design option for an LED‑based wall pack. Bill of materials Table 12: Bill of materials for CXA3050 wall pack Component Order Code/Model Number Company Web Link Tyco Electronics Corporation www.te.com/catalog/minf/en/894?BML=L2VuL2luZHVzdHJpZXMvbGln aHRpbmcvdGUtbGVkLWhvbGRlcnMuZXh0ZXJuYWxIZWFkZXIuaHRtbA Connector 2-2154857-2 Driver LDB100-048SW Excelsys Technologies www.excelsys.com/wp-content/uploads/2012/06/LDB100.pdf Heat sink 10.080” HeatsinkUSA LLC www.heatsinkusa.com/10-080-wide-extruded-aluminum-heatsink/ LED CXA3050-0000-000N0HX20E5 Cree, Inc. CXA3050 product page Reflective paper F-16 White98 White Optics LLC whiteoptics.com/White97%20Film%20data%20sheet.pdf Thermal compound Silver Ice Timtronics www.timtronics.com/electricallyconductive.htm 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 © 2013-2016 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]. 16