Summary form only given. White light-emitting diodes (LED) became a commercial reality almost three decades after the demonstration of the first monochromatic LED. The LED's potential for energy savings and the promise of reduced maintenance costs are the two main features that caught the attention of the community interested in general illumination. So far, LEDs have proved their usefulness and have started to displace traditional light sources, such as the incandescent lamp, in certain niche applications where monochromatic light is required. However, LEDs have yet to demonstrate their capabilities in general lighting applications. At present, researchers and manufacturers around the world are aggressively working toward developing a light source that could replace traditional light sources, such as incandescent and fluorescent lamps, in general lighting applications. For LEDs to directly compete with any of these technologies for a given application, they have to meet the characteristics of the target light sources in all areas. As an example, although amber LEDs have demonstrated luminous efficacies greater than 100 Im/W, they cannot compete with fluorescent lamps in office lighting applications because luminous efficacy is not the only parameter that makes a fluorescent lamp suitable for this application. A lighting specifier considers several parameters prior to selecting a light source for a given application. The parameters usually considered include light output, color (color appearance and color rendering properties), lamp life, and cost (initial and life cycle cost). The importance of any of these parameters varies widely depending on the application. For example, in a residential lighting application, cost, color, and light output are the most important parameters. That is why the incandescent lamp has been so popular in this application. Alternatively, in commercial office lighting applications, the linear fluorescent lamp became the most popular light source because light output, color, and lamp life are the most important parameters in this application. Presently, the community interested in developing solid-state light sources is targeting high luminous efficacy, greater than 200 Im/W, and high color rendering index (CRI), greater than 90, for high-brightness white LEDs. As described above, these parameters alone may not make LED light sources readily acceptable for general illumination applications. Therefore, the goal of this tutorial paper is to introduce the relevant lighting parameters to those interested in developing solid-state light sources and help them understand the needs of the lighting community.


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    Titel :

    Requirements for solid-state lighting


    Beteiligte:
    Narendran, N. (Autor:in)


    Erscheinungsdatum :

    2004-01-01


    Format / Umfang :

    87767 byte



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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