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Cree XLamp® MP-L EasyWhite™ Pendant Luminaire Reference Design

IP.com Disclosure Number: IPCOM000201772D
Publication Date: 2010-Nov-22
Document File: 20 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

This application note demonstrates a remarkably simple way to incorporate the Cree XLamp® MP-L EasyWhite™ LED into a pendant light, a popular hanging luminaire that has traditionally used A-form incandescent bulbs and more recently self-ballasted CFLs.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 9% of the total text.

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Cree XLamp® MP-L EasyWhite Pendant Luminaire Reference Design

Application Note


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This application note demonstrates a remarkably simple way to incorporate the Cree XLamp® MP-L EasyWhite™ LED into a pendant light, a popular hanging luminaire that has traditionally used A-form incandescent bulbs and more recently self-ballasted CFLs.

Pendant lights are not particularly efficient fixtures to begin with. When used with colored glass shades, large fractions of fLux from the illumination source are absorbed by the shade. The fixtures offer a pleasing "glow" and "look" and so enjoy considerable popularity, even with the inherent loss of light. However, when used with a frosted white shade, an XLamp MP-L-based pendant can be an Energy Star-conformant SSL luminaire.

Luminaire design with the XLamp MP-L EasyWhite LED sets a new standard for ease of use in LED specification, design and implementation, giving an attractive, energy- efficient and compelling result.

In presenting this design, our team has sought to create a luminaire with a 50,000-hour lifetime, created through a low-power/high-efficacy instrumentation of the LED. We created these pendant prototypes without a great deal of thermal and electrical analysis at the beginning. Rather, we took educated guesses at many of the required parameters and performed our analysis after the fact. The XLamp MP-L EasyWhite pendant is so easy to work with that this approach produced dramatic results with just a few days of effort.

Application Note: CLD-AP40 Rev 1

Table of Contents

Table of Contents...................................................................................................................................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.........................................................5
4. Calculate the Number of LEDs..........................................................................................................8
5. Consider All Design Possibilities........................................................................................................8
6. Complete the Final Steps: Implementation and Analysis......................................................................9

Conclusions............................................................