A dimmable ceramic metal halide lamp for indoor use

E.J.E. Cottaar, P. Antonisen, J. Hendricx, R. Klaassen, R. Zande, van der, R. Waard, de, U. Mos, P. Oeyen, M. Meeuwssen, R. Raas, D. Vos, R. Rodriguez Ojeda, A. Wateren, van der

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    Ceramic Metal Halide Lamps have been around for approximately 15 years as very efficient, high quality light sources in retail and other public areas. A drawback of these lamps is the fact they cannot be dimmed: dimming leads to a significant loss of light quality (shift of the color point, too high loss in color rendering) and problems related to arc stability (flickering). A dimmable Ceramic Metal Halide lamp without these disadvantages is now available. Two main steps have led to this product. The first step is the development of a lamp which is unsaturated with respect to the salts during operation: no liquid salts are present. This results into a much lower dependence of the emitted radiation, and thus the light quality, on the power of the lamp. When dimmed the characteristics of the lamp stay sufficiently constant for the application until the power is so low that saturation starts to occur. Such an unsaturated burner requires a new, fritless electrode feedthrough, a new sealing technology to close the arc tube after filling and full control of the chemical reactions in the lamp. The second step is the development of a driver, appropriate for stable electrical operation up to relatively low power levels. Especially during commutation, a proper control of electrode plasma interface behavior is required. Next to dimming, the developed technologies also enable other advances in Ceramic Metal Halide lamps: since the cold spot and reaction of salt pools with the wall or sealing frit are no longer a limitation, new lamp fills are possible. E.g., lamps fills leading to very high efficacies (>120
    Original languageEnglish
    Title of host publicationProceedings of the Illuminating Engineering Society conference 2010 (IES2010), 7-9 November 2010, Toronto, Canada
    Publication statusPublished - 2010
    Eventconference; IES conference 2010, Toronto, Canada -
    Duration: 1 Jan 2010 → …


    Conferenceconference; IES conference 2010, Toronto, Canada
    Period1/01/10 → …
    OtherIES conference 2010, Toronto, Canada


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