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CLD-DG rev D Cree XLamp CXA LED Design Guide Product TDecehsniigcanl Garutiicdlee www cree com XLamp CCooppyyrriigghhtt ? ? -C r e e CInrece AIlnl cri gAhltlsrirgehstesrrveesde rvTehde iTnhfoerminfaotriomnaitniotnhins tdhoicsudmoceunmt iesnstuisbjseucbtjetoctcthoacnhgaenwgeithwoituhtonuottnicoet ice Cree the CCrreeee ltohgeoCarnede XloLgaomapn daXreLarmegpisaterererdegtriastdeermedartkrasdoefmCarerkes IonfcC rAelel oItnhce r trademarks products and company names mentioned in this document are the property of their respective owners This document is provided for informational purposes only and is not a warranty or a speci ?cation For product speci ?cations please see the data sheets available at www cree com For warranty information please contact Cree Sales at sales cree com Cree Inc Silicon Drive Durham NC USA Tel CXA Design Guide Table of Contents Introduction About This Design Guide Thank You CXA Family Product Cautions Storage Handling Mechanical Design Typical Assembly Connectors Connector Resources Mechanical Damage to Light Emitting Surface Preventing Damage to CXA LEDs Handling Assembly Thermal Design Heat Lifetime Heat Light Output Ambient Temperature Measurement Thermocouple Attachment Luminaire Case Temperature Measurement Operating Limits Low Temperature Operation Heat Sink Flatness and Cleanliness Thermal Interface Materials Thermal Design Resources Electrical Considerations Multiple CXA LEDs Electrical Overstress Hot- Plugging Dielectric Voltage Withstand Testing Reverse Voltage Chemical Compatibility Chemical Resources Hermetically Sealing Luminaires Optical Considerations Optical Design CXA Lens Material Considerations CXA LEDs and Silicone CXA Light Emitting Surface Comparison Optical Design Resources CXA LED How ? To How To Select a Speci ?c CXA LED - the Product Characterization Tool How to Select a Driver How to Assemble a CXA LED into a Lighting System Safety Compliance Summary Design Examples Decorative Downlight Pendant Track Light Copyright ? - 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 All other trademarks products and company names mentioned in this document are the property of their respective owners This document is provided for informational purposes only and is not a warranty or a speci ?cation For product speci ?cations please see the data sheets available at www cree com For warranty information please contact Cree Sales at sales cree com ii CXA Design Guide Introduction This guide simpli ?es the CXA luminaire design e ?ort by providing basic information on the requirements to use Cree XLamp CXA LEDs successfully in luminaire designs with appropriate consideration for mechanical electrical thermal and optical design and chemical compatibility In addition the Cree Solution Provider CSP program assists lighting manufacturers in identifying components and materials that work with Cree LEDs In this document the term CXA LEDs refers to Cree ? s ceramic substrate CXA LEDs i e all the CXA LEDs except the CXA Cree ? s CXA LEDs deliver high lumen output and e ?cacy in a family of single easy ? to ? use components CXA LEDs enable lighting manufacturers to quickly add LED products to their product portfolio With Cree ? s CXA LEDs lighting manufacturers can have performance reliability and ease-of-use in a single