Ceramic metal halide lamp with length to diameter ratio

High color rendition (Ra 80) and high efficiency ( 100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal s...

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Bibliographic Details
Main Authors HAMANO MOTONORI, AOKI SHIGEYUKI, MAEHARA AKIYOSHI
Format Patent
LanguageEnglish
Published 08.01.2013
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Summary:High color rendition (Ra 80) and high efficiency ( 100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal shape in the direction of the longitudinal axis by way of a transition curve with no angled corner, and the arc tube is designed to effective length L/effective inner diameter D of 1.8 to 2.2, and formed to such a size that the lowest temperature of the arc chamber is 800° C. or higher and the highest temperature of the arc chamber is 1200° C. or lower during lighting, and at least thulium iodide, thallium iodide, sodium iodide, and calcium iodide are sealed as metal halides where sodium iodide and calcium iodide are sealed by a molar ratio of 40 to 80% and less than 30%, respectively, based on the entire metal halides.
Bibliography:Application Number: US201013258116