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www. cree.com/xlamp c opyright ? 2010 c ree, inc. a ll rights reserved. the information in this document is subject to change without notice. cree, the cree logo and xl amp are registered trademarks of cree, inc. cl d- ap124 rev 0 cree ? xlamp ? cxa2520 led 6-inch downlight reference design cree, inc. 4600 silicon drive durham, nc 27703 us a tel: +1.919.313.5300 application note c opyright ? 2013 c ree, inc. a ll rights reserved. the information in this document is subject to change without notice. cree ? , the c ree logo and x lamp ? are registered trademarks of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact c ree sales at sales@cree.com. o ther trademarks, product and company names are the property of their respective owners and do not imply specifc product and/or vendor endorsement, sponsorship or association. introduction this application note details the design of a 6-inch downlight that exceeds the performance of typical 42?watt compact fuorescent lamp (cfl) products. the design uses c rees xlamp cxa2520 le d, a multi- die, high?fux array optimized for high lumen output applications such as downlights, recessed fxtures and can lights. the cxa 2520 offers lighting-class performance and reliability in a single, easy-to-use component. six-inch downlights are the industry standard indoors and outdoors in both residential and commercial applications such as soffts and ceilings, where a wide beam pattern is desirable. w ith a typical light output range from 1500 to 3600 lumens, the fexibility, high performance and ease of use offered by the x lamp cxa2520 le d makes it a strong candidate for use in a 6-inch downlight. table of contents introduction ....................................................... 1 design approach/objectives ................................. 2 the 6-step methodology ...................................... 2 1. defne lighting requirements ........................... 2 2. defne design goals ....................................... 5 3. estimate effciencies of the optical, thermal & electrical systems ......................................... 5 4. calculate the number of leds ......................... 8 5. consider all design possibilities ....................... 9 6. complete the fnal steps: implementation and analysis ....................................................... 9 conclusion ....................................................... 11 special thanks ................................................. 12 bill of materials ................................................ 12 reliance on any of the information provided in this application note is at the users sole risk. cree and its affliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any le d-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 c ree or a third party. l uminaire manufacturers who base product designs in whole or part on any cree a pplication note or r eference design are solely responsible for the compliance of their products with all applicable laws and industry requirements.
2 building on c rees reference designs of 6-inch downlights using xlamp cxa 2011 and xm-l le ds, this design demonstrates the possibility of employing the xlamp cxa2520 led as the light source of a 42?watt cfl equivalent downlight for use in indoor commercial and residential applications. 1 design approach/objectives in the led l uminaire design guide 2 c ree advocates a 6-step framework for creating le d luminaires. all c ree reference designs use this framework, and the design guides summary table is reproduced below in table 1. step explanation 1. defne lighting requirements ? the design goals can be based either on an existing fxture or on the applications lighting requirements. 2. defne design goals ? specify design goals, which will be based on the applications lighting requirements. ? specify any other goals that will infuence the design, such as special optical or environmental requirements. 3. estimate effciencies of the optical, thermal & electrical systems ? design goals will place constraints on the optical, thermal and electrical systems. ? good estimations of effciencies of each system can be made based on these constr aints. ? the combination of lighting goals and system effciencies 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. c onsider all design possibilities and choose the best ? w ith any design, there are many ways to achieve the goals. ? led lighting is a new feld; assumptions that work for conventional lighting sources may not apply. 6. complete fnal steps ? c omplete circuit board layout. ? test design choices by building a prototype luminaire. ? m ake sure the design achieves all the design goals. ? use the prototype to further refne the luminaire design. ? r ecord observations and ideas for improvement. table 1: cree 6-step framework the 6-step methodology the goal of the design is to show the ease of design and implementation of a 6-inch downlight using one c ree xlamp cxa2520 le d that betters the performance of typical 42- watt cfl downlights. 1. define lighting requirements table 2 shows a ranked list of desirable characteristics for a 6-inch downlight. 1 cree xlamp cxa2011 le d 6-inch downlight r eference design, ap 92, www.cree.com/xlamp_ref_des/cxa2011_6in_downlight c ree xlamp xm-l le d 6-inch downlight r eference design, ap 93, www.cree.com/xlamp_ref_des/xml_6in_downlight 2 led luminaire design guide, application note ap 15, www.cree.com/xlamp_app_notes/luminaire_design_guide xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
3 importance characteristics units critical luminous fux (steady ?state) lumens (lm) effcacy lumens per watt (lm/w) luminous distribution c olor uniformity form factor important price $ m anufacturability lifetime hours o perating temperatures degrees (c) o perating humidity % relative humidity correlated color temperature (cct) k color rendering index (cri) 100-point scale ease of installation table 2: some ranked design criteria for an led downlight table 3 and table 4 summarize the energy star requirements for luminaires. 3 luminaire type luminaire effcacy (initial) energy star requirements luminaire minimum light output (initial) luminaire zonal lumen density requirement downlights: ? recessed ? surface ? pendant ? ssl downlight retrofts 42 lm/w 4.5 aperture: 345 lumens > 4.5 aperture: 575 lumens l uminaire shall deliver a minimum of 75% of total initial lumens within the 0? 60 zone (axially symmetric about the nadir) table 3: energy star luminous effcacy, output and zonal lumen density requirements characteristic requirements light source life requirements: all luminaires the led package(s) / led module(s) / led array(s), including those incorporated into led light engines or gu24 based integrated led lamps, shall meet the following l70 lumen maintenance life values (refer to lumen maintenance requirements in the next section): ? 25,000 hours for residential grade indoor luminaires ? 35,000 hours for residential grade outdoor luminaires ? 35,000 hours for commercial grade luminaires lumen maintenance life projection claims in excess of the above requirements shall be substantiated with a tm ?21 lumen maintenance life projection report. 3 energy star? program requirements, product specifcation for luminaires (light fixtures), eligibility criteria, version 1.2, www.energystar.gov/ia/partners/product_specs/program_reqs/final_luminaires_v1_2.pdf?7b7d ?2473 xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
4 characteristic requirements lumen maintenance requirements: directional and non-directional luminaires the led package(s) / module(s) / array(s), including those incorporated into led light engines or gu24 based integrated led lamps, shall meet the following l 70 (6k) rated lumen maintenance life values, in situ: ? l 70 (6k) 25,000 hours for residential indoor ? l 70 (6k) 35,000 hours for residential outdoor, or commercial c ompliance with the above shall be documented with a tm-21 lumen maintenance life projection report as detailed in tm -21, section 7. the report shall be generated using data from the lm -80 test report for the employed led package/module/array model (device), the forward drive current applied to each device, and the in situ tmp led temperature of the hottest led in the luminaire. in addition to lm ?80 reporting requirements, the following information shall be reported: ? sampling method and sample size (per lm ?80 section 4.3) ? test results for each t s and drive current combination ? description of device including model number and whether device is an led package, module or arr ay (see defnitions) ? ansi target, and calculated cct value(s) for each device in sample set ? uv chromaticity shift value on the cie 1976 diagram for each device in sample set ? a detailed rationale, with supporting data, for application of results to other devices (e.g. led packages with other ccts) access to the tmp led for the hottest led may be accomplished via a minimally sized hole in the luminaire housing, tightly resealed with a suitable sealant if created for purposes of testing. a ll thermocouple attachments and intrusions to luminaire housing shall be photographed. cct requirements: all indoor luminaires the luminaire (directional luminaires), or replaceable led light engine or gu24 based integr ated led lamp (non? directional luminaires) shall have one of the following nominal ccts: ? 2700 kelvin ? 3000 kelvin ? 3500 kelvin ? 4000 kelvin ? 5000 kelvin (commercial only) the luminaire, le d light engine or gu24 based integrated led lamp shall also fall within the corresponding 7-step chromaticity quadrangles as defned in ansi/nema/anslg c78.377 ?2008. color rendering requirements: all indoor luminaires the luminaire (directional luminaires), or replaceable led light engine or gu24 based integr ated led lamp (non? directional luminaires) shall meet or exceed ra 80. c olor angular uniformity requirements: directional solid state indoor luminaires throughout the zonal lumen density angles detailed above, and fve degrees beyond, the variation of chromaticity shall be within 0.004 from the weighted average point on the cie 1976 (u,v) diagram. color maintenance requirements: solid state indoor luminaires only the change of chromaticity over the frst 6,000 hours of luminaire operation shall be within 0.007 on the cie 1976 (u,v) diagram, as demonstrated by either: ? the ies lm -80 test report for the employed le d package/array/module model, or ? as demonstrated by a comparison of luminaire chromaticity data in lm ? 79 reports at zero and 6,000 hours, or ? as demonstrated by a comparison of le d light engine or gu24 based integrated le d lamp chromaticity data in lm? 82 reports at zero and 6,000 hours. source start time requirement: directional and non-directional luminaires l ight source shall remain continuously illuminated within one second of application of electrical power. power factor requirements: directional and non-directional luminaires total luminaire input power less than or equal to 5 watts: pf 0.5 total luminaire input power greater than 5 watts: residential: pf 0.7 commercial: pf 0.9 transient protection requirements: all luminaires ballast or driver shall comply with ansi/ieee c62.41.1-2002 and ansi/ieee c62.41.2-2002, 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 frequency requirements: directional and non-directional luminaires frequency 120 hz note: this performance characteristic addresses problems with visible ficker due to low frequency operation and applies to steady ? state as well as dimmed operation. dimming operation shall meet the requirement at all light output levels. xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
5 characteristic requirements noise requirements: directional and non-directional luminaires all ballasts & drivers used within the luminaire shall have a class a sound rating. ballasts and drivers are recommended to be installed in the luminaire in such a way that in operation, the luminaire will not emit sound exceeding a measured level of 24 b a. table 4: energy star luminaire requirements 2. define design goals typical 42- w cfl downlights use a lamp that produces about 3100 lm, but luminaire light output is only about 2000 lm, giving a fxture effciency of about 65%. we chose the design goals for this project, shown in table 5, to better this performance using less energy over a longer lifetime. we chose a 50 cutoff angle as a good balance between maximizing direct illumination and minimizing glare. as shown in figure 1, the cutoff angle is measured from the vertical axis of the luminaire outward to the point at which the brightness of the light source is no longer visible. figure 1: cutoff angle characteristic unit minimum goal target goal light output lm 2000 > 2000 luminaire effcacy lm/w 75 > 75 cutoff angle degrees 50 50 lifetime hours 35,000 50,000 cct k 3000 3000 cri 100-point scale 80 > 80 p ower w 26 < 26 p ower factor 0.9 > 0.9 table 5: design goals 3. estimate efficiencies of the optical, thermal & electrical systems we used crees product characterization tool (pct) tool, shown in figure 2, to determine the drive current for the design. 4 for the 2000 ? lumen target, we estimated 90% optical effciency and 87% driver effciency. we also estimated a solder point temperature (t sp ) of 45 c. 4 pc t is available at: pct.cree.com light source cutoff angle xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
6 figure 2: pct view of the number of leds used and driving current the pct shows that, at 600 ma, one cxa2520 led provides suffcient light output to meet the design goal. thermal requirements w e used a commercially available heat sink/housing, shown in figure 3, for the 6-inch downlight in this reference design. 5 the heat sink/housing is made of anodized forged aluminum. the heat sink/housing is part of a kit that includes a cover glass and front trim ring. figure 3: top (left), side (center) and bottom (right) views of heat sink/housing we performed thermal simulations to verify this thermal design is suffcient. figure 4 shows the thermal simulation results for the design. the simulated t sp is 46 c. 5 model adc 10, xing yi lighting, www.xingyilight.com/main.asp 1 led system comparison report system: 2,000 90% 87% model model model flux q2 [2100] tsp (oc) 45 flux 30f 90% [694] tj (oc) 85 flux tj (oc) 25 price - $ price - $ price - $ sys # led sys lm tot sys w sys lm/w sys # led sys lm tot sys w sys lm/w 0.520 2 3800.65 43.447 87.5 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.530 2 3856.12 44.35 86.9 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.540 2 3911.04 45.254 86.4 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.550 2 3965.44 46.16 85.9 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.600 1 2114.42 25.351 83.4 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.650 1 2239.96 27.637 81 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.700 1 2359.8 29.937 78.8 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a led 2 led 3 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 ? 2009-2012 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. cree xlamp cxa2520 {ezw} cree xlamp mt-g2: 36v {ezw} (none) target lumens : optical efficiency: electrical efficiency: current (a) led 1 xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
7 figure 4: thermal simulation of cxa2520 downlight driver the driver for this downlight can be located above the ceiling, apart from the downlight, and there is no driver size limit. w e used a universal input voltage constant-current driver, shown in figure 5. 6 the driver is a slightly modifed version of a commercially available driver model. figure 5: cxa2520 downlight driver secondary optics we used a custom refector to achieve the desired 50 cutoff angle. 7 the refector, shown in figure 6, is about 90% optically effcient and fts within the heat sink/housing. the refector may also be suitable for use in spotlights and track luminaires. 6 model sp? 22v2a pfc, shenzhen sgq electronic technology co. ltd, sgqsz.cn.gongchang.com 7 model 5711-e, nata lighting c ompany l imited, www.nata.cn/ thermal simulation / measurement copyright ? 2010, cree, inc. cree proprietary & confidential pg. 9 thermal simulation tsp ~45c, ? about 75% of the 26w input power will convert to heat and need sufficient heatsink to dissipate the heat ? thermal measurement by thermal couple: tsp ~41c ? calculated tj ~59c tsp t2 t3 40.8 38.7 thermal simulation / measurement copyright ? 2010, cree, inc. cree proprietary & confidential pg. 9 thermal simulation tsp ~45c, ? about 75% of the 26w input power will convert to heat and need sufficient heatsink to dissipate the heat ? thermal measurement by thermal couple: tsp ~41c ? calculated tj ~59c tsp t2 t3 40.8 38.7 xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
8 figure 6: cxa2520 downlight refector 4. calculate the number of leds the purpose of this reference design is to show that a single xlamp cxa2520 led can deliver equivalent lighting utility and superior performance compared to existing 42- w cfl downlights on the market. the cxa2520 le d is a multi-chip led package that can offer the required lumens with new levels of led ?to? led color consistency and effciency. the new xlamp cxa 2520 le d is 15% brighter than the original cxa2011, 8 which can enable superior le d lighting designs even more quickly. w e selected a w arm white le d for this reference design, shown highlighted in yellow in table 6. by choosing an led from a mid? level fux bin, we ensured that the design uses an led that is readily available. color cct range base order codes min. luminous flux @ 550 ma 2-step order code 4-step order code group flux (lm) @ 85 c flux (lm) @ 25 c* chromaticity region chromaticity region easywhite 4000k q2 2100 2379 40h cxa2520 ? 0000 ? 000n00q240h 40f cxa2520?0000?000n00q240f q4 2260 2560 cxa2520 ? 0000 ? 000n00q440h cxa2520?0000?000n00q440f r2 2420 2741 cxa2520-0000-000n00r240h cxa2520-0000-000n00r240f 3500k p4 1965 2226 35h cxa2520-0000-000n00p435h 35f cxa2520-0000-000n00p435f q2 2100 2379 cxa2520 ? 0000 ? 000n00q235h cxa2520?0000?000n00q235f q4 2260 2560 cxa2520 ? 0000 ? 000n00q435h cxa2520?0000?000n00q435f 3000k p4 1965 2226 30h cxa2520-0000-000n00p430h 30f cxa2520-0000-000n00p430f q2 2100 2379 cxa2520 ? 0000 ? 000n00q230h cxa2520?0000?000n00q230f 2700k p2 1830 2073 27h cxa2520-0000-000n00p227h 27f cxa2520-0000-000n00p227f p4 1965 2226 cxa2520-0000-000n00p427h cxa2520-0000-000n00p427f q2 2100 2379 cxa2520 ? 0000 ? 000n00q227h cxa2520?0000?000n00q227f table 6: cxa2520 led order codes 8 at 1 a, junction temperature (t j ) = 85 c xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
9 5. consider all design possibilities there is a multiplicity of ways to design an le d-based downlight. this reference design aims to show that a single easy- to-use cxa2520 led enables a downlight offering superior performance. this design presents a number of desirable performance ? related benefts that are results of the xlamp cxa2520 led package. because the cxa 2520 le d uses easyw hite? technology, led-to-le d color consistency can be held to within two or four mcadam ellipses for any given cct, depending on the order code. the cxa2520 led is binned at 85 c, so the cc t will be as faithful as possible to the system operating environment. these component features allow for new levels of specifcation accuracy. however, the primary purpose of this reference design is to show how simple and straightforward it is to design with c rees xlamp cxa2520 le d. this application note is not intended to show the only way to do this, but instead demonstrate the ease of implementation with this set of engineering constraints. c ertainly numerous other successful solutions are possible. the performance range of the x lamp cxa2520 le d enables a wide variety of luminaires that all use a single cxa2520 le d. cc ts from 2700 k to 5000 k and lumen output up to 4500 lm 9 is available, providing the fexibility to offer a variety of luminaires that use a single led light source and refector. this fexibility is enhanced by the xlamp cxa2530 led, which has the same physical dimensions and optical source size as the cxa2520 and offers even more design possibilities. 6. complete the final steps: implementation and analysis using the methodology described above, we determined a suitable combination of an le d, components and drive conditions. this section describes how cree assembled the downlight and shows the results of the design. prototyping details 1. we verifed the component dimensions to ensure a correct ft. 2. w e attached the cxa2520 le d to the heat sink with a small amount of thermally conductive epoxy. 10 thermally conductive compound can also be used. 11 3. a fter the thermal epoxy cured, we fed the driver output wires through the heat sink and soldered them to the le d, following the recommendations in c rees soldering and handling application note for the cxa2520 le d. 12 4. we tested the connection by applying power and verifed the led lit up. 5. we positioned the refector on the led, added the cover glass and secured both parts to the heat sink with the screw-on front trim ring. 6. we performed fnal testing. 9 at 61 w, 85 c 10 w e used silanex technology st0903. www.silanex.com/ product03.htm 11 r efer to c rees chemical c ompatibility application note for compounds that are safe to use with cree leds. c ree xlamp led chemical c ompatibility application note, ap 63, www.cree.com/products/pdf/xlamp_chemical_c omp.pdf 12 c ree xlamp cxa family leds soldering and handling, application note ap 74, www.cree.com/xlamp_app_notes/cxa_sh xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
10 results thermal results cree verifed the board temperature with a thermocouple to confrm that the thermal dissipation performance of the heat sink aligns with our simulations. the measured solder point temper ature was 41 c. based on the measured solder point temperature, the t j can be calculated as follows. t j = t sp + (led power * led thermal resistance) t j = 41 c + (26 w * 0.8 c/w) t j = 62 c this thermal performance is in line with the thermal simulation. estimated led lifetime based on thousands of hours of long-term testing of the cxa2011 le d at higher temperatures than the measured 41 c t sp of the cxa2520 downlight, cree expects an l70 lifetime signifcantly longer than 50,000 hours. 42 ? w cfl lamps typically have lifetimes ranging from 10,000 to 12,000 hours, so the 4 to 5 times longer lifetime of the cxa2520 downlight offers solid maintenance cost savings. optical and electrical results we tested the downlight in a 1.5 ? meter sphere after a 60? minute stabilization time to obtain the results in table 7. 13 as the table shows, the downlight meets the target goals for the design. the 2140-lm light output positions this downlight in the upper reaches of the light output of downlights currently on the market. the downlight also meets the energy star light output, effcacy, power factor, cct and cri requirements. characteristic unit downlight luminous fux lm 2140 luminaire effcacy lm/w 82 cutoff angle 50 cct k 3046 cri 100-point scale 80 p ower w 26.1 p ower factor 0.95 table 7: cxa2520 downlight steady-state results we also tested the intensity distribution of the downlight. figure 7 shows an even intensity distribution with a 56 beam angle. the fgure also shows the 50 cutoff angle that was a goal of this effort. 13 testing was performed at the crees shenzhen technology center. an ies fle for the downlight is available at: www.cree.com/ xlamp_app_notes/cxa2520_downlight_ies xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
11 figure 7: angular luminous intensity distribution of cxa2520 downlight table 8 shows the center beam illuminance of the cxa 2520 downlight at various distances from the light source. height center beam illuminance beam width 0.5 m 1.7 ft 926 fc 9,970 lx 0.6 m 1.8 ft 1.0 m 3.3 ft 231 fc 2,492 lx 1.1 m 3.5 ft 1.5 m 5.0 ft 103 fc 1,107 lx 1.6 m 5.3 ft 2.0 m 6.6 ft 58 fc 623 lx 2.2 m 7.1 ft 2.5 m 8.3 ft 37 fc 399 lx 2.7 m 8.9 ft 3.0 m 9.9 ft 26 fc 279 lx 3.2 m 10.6 ft table 8: cxa2520 downlight illuminance C 56 beam angle conclusion this reference design illustrates the ease of developing a very capable 6-inch downlight based on the c ree xlamp cxa2520 le d. the small number of steps to assemble the downlight illustrates the simple construction the cxa2520 cutoff angle = 50 xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
12 le d enables, lowering system cost. simplicity of use and lighting-class performance make the c ree xlamp cxa2520 le d an attractive design option for an led-based 6-inch downlight. special thanks c ree would like to acknowledge and thank the following partner companies for collaborating in the successful prototyping of this downlight. ? shenzhen sgq electronic technology co. ltd. ? nata lighting c ompany l imited - www.nata.cn bill of materials component order code/model number company web link driver sp-22v2a pfc shenzhen sgq electronic technology co. ltd. sgqsz.cn.gongchang.com heat sink/housing, cover glass, front trim ring kit adc 10 xing yi lighting www.xingyilight.com/main.asp led cxa2520?0000?000n00q230h cree, inc. www.cree.com/cxa2520 refector 5711-e nata lighting c ompany limited www.nata.cn thermal epoxy st0903 silanex technology pte ltd. www.silanex.com/ product03.htm table 9: bill of materials for cxa2520 6-inch downlight reliance on any of the information provided in this application note is at the users sole risk. cree and its affliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any le d-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 c ree or a third party. l uminaire manufacturers who base product designs in whole or part on any cree a pplication note or r eference design are solely responsible for the compliance of their products with all applicable laws and industry requirements. xlamp cxa 2520 led 6-inch downl ight reference design copyright ? 2013 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. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.

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