NDLI: Characteristic improvement of inductively coupled electrode-less metal halide lamps

Content Provider	IEEE Xplore Digital Library
Author	Uemura, K. Ishigami, T. Itoh, A. Yokozeki, I. Shimizu, K.
Copyright Year	2000
Description	Author affiliation: Toshiba Lighting & Technol. Corp., Tokyo, Japan (Uemura, K.)
Abstract	Summary form only given. Inductively coupled electrode-less metal halide lamps were expected to show high efficacy and good life performance and had been studied extensively. At first, at LS6 in 1992, a new inductively coupled HID lighting system was proposed. Since then, improvement of operating circuit efficacy and operation stability of the system has been discussed by using the current limitation of the co-axial cable for impedance matching circuit. On the other hand, dosing tin halides in those arc tubes was tried to extend their life. In this study, to put these systems into practical use, improving lamp efficacy, confirming effect of tin halides on their life performance and improving their operation stability by decreasing Q value, which is resonance constant of their impedance matching circuit, were attempted. As a result, the lamp efficacy reached 180 1m/W with white light and 58% of visible radiation power ratio to the input power was realized by optimizing rare gas pressure, input wattage, a sort of doses and by employing the elliptical-shape outer jacket with uniform temperature distribution on the arc tube surface. Their life performance was confirmed that the lamps with tin halides were abler to survive up to 60000 hours at rated load operation without decreasing lumen output, because tin halides absorb iodine gas generated in the arc tube. Optimizing the distance between the coil and the arc tube, the arc tube diameter and the rare gas pressure, Q value was decreased by 22% without reducing the lamp performance.
File Size	99150
File Format	PDF
ISBN	0780359828
ISSN	07309244
DOI	10.1109/PLASMA.2000.855087
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High intensity discharge lamps Tin Coupling circuits Circuit stability Impedance matching Optical coupling Power cables Coaxial cables Resonance RLC circuits
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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