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CXA2520-0000-000N00R240H Fiches technique(PDF) 2 Page - Cree, Inc |
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CXA2520-0000-000N00R240H Fiches technique(HTML) 2 Page - Cree, Inc |
2 / 12 page 2 XLamp CXa2520 LED 6-inCh DownLight 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 specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. Building on cree’s reference designs of 6-inch downlights using Xlamp cXa2011 and Xm-l leDs, 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 luminaire Design Guide”2 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 in Table 1. 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. 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 cree Xlamp cXa2520 leD 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 leD 6-Inch Downlight reference Design, ap92, www.cree.com/Xlamp_ref_des/cXa2011_6in_downlight cree Xlamp Xm-l leD 6-Inch Downlight reference Design, ap93, www.cree.com/xlamp_ref_des/Xml_6in_downlight 2 leD luminaire Design Guide, application Note ap15, www.cree.com/xlamp_app_notes/luminaire_design_guide |
Numéro de pièce similaire - CXA2520-0000-000N00R240H |
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Description similaire - CXA2520-0000-000N00R240H |
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