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LED Luminaire Design Guide

IP.com Disclosure Number: IPCOM000201775D
Publication Date: 2010-Nov-22
Document File: 16 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

This application note provides guidelines for the process of designing high-power LEDs into luminaires. This document uses an indoor luminaire design as an example, but the process described can be applied to the design of any LED luminaire.

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This is the abbreviated version, containing approximately 9% of the total text.

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LED Luminaire Design Guide

This application note provides guidelines for the process of designing high-power LEDs into luminaires. This document uses an indoor luminaire design as an example, but the process described can be applied to the design of any LED luminaire.

Lighting-class LEDs are now available that deliver the brightness, efficacy, lifetime, color temperatures, and white-point stability required for general illumination. As a result, these LEDs are being designed into most general lighting applications, including roadway, parking area, and indoor directional lighting. LED-based luminaires reduce total-cost-of-ownership (TCO) in these applications through maintenance avoidance (since LEDs last much longer than traditional lamps) and reduced energy costs.

There are over 20 billion light fixtures using incandescent,
halogen, or fLuorescent lamps worldwide. Many of these fixtures are being used for directional light applications but are based on lamps that put out light in all directions. The United States Department of Energy (DOE) states that recessed downlights are the most common installed luminaire type in new residential construction. In addition, the DOE reports that downlights using non-refLector lamps are typically only 50% efficient, meaning half the light produced by the lamp is wasted inside the fixture.

In contrast, lighting-class LEDs offer efficient, directional light that lasts at least 50,000 hours. Indoor luminaires designed to take advantage of all the benefits of lighting-class LEDs can:

Exceed the efficacy of any incandescent and halogen luminaire
Match the performance of even the best CFL (compact fLuorescent) recessed downlights
Provide a lifetime five to fifty times longer than these lamps before requiring maintenance
Reduce the environmental impact of light: no mercury, less power-plant pollution, and less landfill waste

Table of Contents

Design Approach.................................................................................................... 2
Design Process....................................................................................................... 3
1. Define Lighting Requirements............................................................................ 4
2. Define Design Goals............................................................................................ 5
3. Estimate Efficiencies of the Optical, Thermal & Electrical Systems..................... 6
4. Calculate Number of LEDs Needed...................................................................... 9
5. Consider All Design Possibilities & Choose the Best............................................ 10
6. Final Steps......................................................................................................... 15
Where to Get Help.................................................................................................. 16

U.S. Department of Ene...