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Lighting Research and Technology
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Effects of dimming 150 W ceramic metal halide lamps on efficacy, reliability and lifetime

EC Guest, HND

GE Lighting Operations Limited, Melton Road, Leicester LE4 7PD, UK, edward.guest{at}ge.com

MH Girach, BSc

Formerly of GE Lighting Operations Limited, Melton Road, Leicester LE4 7PD, UK

SA Mucklejohn, BSc PhD MRSC CChem

Formerly of GE Lighting Operations Limited, Melton Road, Leicester LE4 7PD, UK

U. Rast, HTL

TridonicAtco Schweiz AG, Obere Allmeind 2, CH-8755 Ennenda, Schweiz

Dimming high-intensity discharge (HID) lamps is often proposed as part of energy management schemes for lighting installations. However, the impacts of dimming on HID lamp performance are not well characterised. The impacts of operating 150W ceramic metal halide discharge (CMH) lamps for prolonged periods (up to 11 000 h) at reduced powers have been quantified. CMH lamps of 150W operated at 100W and 76W showed no significant differences in lumen maintenance, survival and colour rendering index compared to similar lamps operated at the rated power for the same time. The experiments confirm that the concept of dimming CMH lamps can be employed in roadlighting schemes, such as NumeLiTe, without detrimental consequences on lamp performance.

Lighting Research and Technology, Vol. 40, No. 4, 333-346 (2008)
DOI: 10.1177/1477153508095728
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