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CXA2520-0000-000N00R240H Fiches technique(PDF) 2 Page - Cree, Inc

No de pièce CXA2520-0000-000N00R240H
Description  6-Inch Downlight Reference Design
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Fabricant  CREE [Cree, Inc]
Site Internet  http://www.cree.com/
Logo CREE - Cree, Inc

CXA2520-0000-000N00R240H Fiches technique(HTML) 2 Page - Cree, Inc

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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


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