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  • IES
    ANSI/IES TM-21-21 Projecting Long-Term Luminous, Photon, and Radiant Flux Maintenance of LED Light Sources
    Edition: 2021
    $54.18
    / user per year

Content Description

The rated flux maintenance life of an LED is the elapsed operating time over which an LED light source maintains a given percentage of its initial light output. The flux maintenance of an LED light source is dependent upon many variables, including the operating temperature, drive current, and technology and materials used to construct the product. As such, the flux maintenance of LEDs can vary not only from manufacturer to manufacturer, but also between different LED package types produced by a single manufacturer. Further, it is important to consider the inherent limits to projected source life as extrapolated from test data. This document updates its recommended method of projecting the flux maintenance of LED light sources from the data obtained by IES LM-80 testing. The update of this document was accomplished by a dedicated TM-21 Working Group of LED industry professionals. The analyses of the IES LM-80 test data provided by major LED manufacturers are used to rationalize and support this document. Much of the IES LM-80 data came from testing that extended to 9,000 hours, and in some cases beyond.

This book also exists in the following packages...

Year Publisher Title Annual Price
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IES
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IES
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Subscription Information

MADCAD.com IES subscriptions are annual and access is concurrency based (number of people that can access the subscription at any given time).

 

Some features of MADCAD.com IES Subscriptions are:

 

- Floating concurrency model: Set your concurrency level and share your IES Subscriptions among your offices enterprise-wide.

- Online access: With MADCAD.com’ s web based subscription service no downloads or installations are required. Access IES Standards from any browser on your computer, tablet or smart phone.

- Customized Subscriptions: Select different number of concurrencies based on your needs. Set higher number of seats for more used IES Subscriptions and lower seats on standards with less need.

 

- Immediate Access: As soon as the transaction is completed, your IES Subscription will be ready for access.

 

For any further information on MADCAD.com IES Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.

About IES

The Illuminating Engineering Society of North America (IES) is the recognized technical authority on illumination. For over 100 years; its objective has been to communicate information on all aspects of good lighting practice to its members, to the lighting community, and to consumers, through a variety of programs, publications, and services.

IES is a forum for the exchange of ideas and information, and a vehicle for its members' professional development and recognition. Through technical committees, with hundreds of qualified individuals from the lighting and user communities, IES correlates research, investigations, and discussions to guide lighting professionals and lay persons via consensus-based lighting recommendations.

The Society publishes nearly 100 varied technical publications, and works cooperatively with related organizations on a variety of programs and in the production of jointly published documents and standards.

Local IES Sections and many lighting corporations offer formal educational programs on lighting, utilizing material developed by IES. Sections offer programs related to specific applications based on IES standards - seminars on sports and recreational lighting, lighting industrial facilities, roadway lighting, museum lighting, to name a few. Virtually every curriculum devoted to lighting - from beginner to advanced - includes IES educational materials.

IES is almost 8,000 members strong. Its members work with lighting in a variety of capacities - lighting designers, architects, interior designers, government & utility personnel, engineers, contractors, manufacturers, distributors, researchers and educators - throughout the United States, Canada, Mexico - and around the world. They share a common interest in lighting, and a common desire to promote the use of the latest, most innovative lighting technologies, with a focus on judicious use of energy in all lighting applications
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