technical article

Copyright © 2010 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

Retail Track Light Reference Design

Cree, Inc.

4600 Silicon Drive

Durham, NC 27703

USA Tel: +1.919.407.5300

AppLiCATion noTE

inTRoDuCTion

This application note details the design of a 39-watt

equivalent retail track light using Cree’s XLamp

CXA2530 LeD. The CXA2530 is optimized to simplify

designs and lower system cost and can enable system-

level performance of 2000 to 5000 lumens. The XLamp

CXA2530 LeD delivers high lumen output and high

efficacy in a single, easy-to-use package that eliminates

the need for reflow soldering.

The XLamp CXA2530 LeD highlighted in this reference

design is optimized to enable applications that

traditionally use halogen, ceramic metal halide (CmH)

and compact fluorescent lamp (CFL) technology. In this

reference design, the XLamp CXA2530 LeD is used in

a retail track light that operates on direct line 120-vAC

input. The goal of the design is to enable a retail track

light with a narrow beam, based on a single XLamp

CXA2530 LeD, delivering performance equivalent to a

39-watt CmH lamp.

data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com.

TAbLE of ConTEnTs

Introduction..........................................................1

Design approach/objectives.............................. 2

The 6-step methodology ................................. 2

1. Define lighting requirements ....................... 2

2. Define design goals ................................. 5

3. Estimate efficiencies of the optical, thermal &

electrical systems ................................... 6

4. Calculate the number of LeDs needed............. 8

5. Consider all design possibilities .................... 9

6. Complete the final steps ............................ 9

Conclusions ...............................................12

Special thanks ............................................13

Bill of materials...........................................13

Appendix ..................................................14

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.