Matsushita Electric Industrial Co., Ltd.

Matsushita Electric Works, Ltd.

Other

Matushita Research and Development Laboraties Inc

Stefaan Maria Lambrechts

Jakob Maya

Huiling Zhu

Timothy Kelly

Shinichi Anami

Nanu Brates

Nobuyoshi Takeuchi

John Francis Waymouth

An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable walls of a selected shape bounding a discharge region of a selected volume through which walls a pair of electrodes are supported with ionizable materials being provided in the discharge region of the discharge chamber comprising at least one member selected from a group consisting of halides of cerium, dysprosium, holmium, lithium, sodium, praseodymium, thallium and thulium, and further comprising a halide of calcium in a selected fraction of that weight total of all halides present in the discharge chamber with this selection depending also on the addition or not of a halide of aluminum. Others of the foregoing halides that are present are provided in amounts with certain limits.

High red color rendition metal halide lamp

An arc discharge metal halide lamp for use in selected lighting fixtures comprising a discharge chamber having light permeable walls of a selected shape including therein a pair of end region wall portions through each of which a corresponding one of a pair of electrodes are supported separated from one another by a separation length. The ratio of the separation length to the effective operation inner diameter of the chamber is greater than two. The lengths of the wall sides between the end wall portions is greater than the effective operation inner diameter. The end wall portions have inner surfaces of constant or smaller varying radii of curvature and they are separated from the interior ends of the electrodes by more than one millimeter. The discharge chamber can be constructed of polycrystalline alumina and contain metal halides.

High efficacy metal halide lamp with configured discharge chamber

An arc discharge metal halide lamp having a discharge chamber having visible light permeable walls bounding a discharge region supported electrodes in a discharge region spaced apart by a distance Lwith an average interior diameter equal to D so they have a selected ratio. Ionizable materials are provided in this chamber involving a noble gas, one or more halides, and mercury in an amount sufficiently small so as to result in a relatively low maximum voltage drop between the electrodes during lamp operation.

High efficacy lamp in a configured chamber

An arc discharge metal halide lamp having a discharge chamber having visible light permeable walls bounding a discharge region supported electrodes in a discharge region spaced apart by a distance Lwith an average interior diameter equal to D so they have a selected ratio with D exceeding a minimum value. Ionizable materials are provided in this chamber involving a noble gas, one or more halides, and mercury in an amount sufficiently small so as to result in a relatively low maximum voltage drop between the electrodes during lamp operation for a lamp dissipation sufficient to have the chamber wall loading exceed a minimum value or so as to maintain chamber luminosity above a minimum value for a selected operational duration.

Metal halide lamp with improved lumen value maintenance

An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls about a discharge region. A pair of electrodes are supported in the discharge region spaced apart from one another. Ionizable materials are provided in the discharge region comprising mercury, a noble gas, and at least two metal halides including a magnesium halide and a sodium halide, a rare earth clement, and thallium iodide in a molar quantity which is between 0.7 and 5% of that total molar quantity of all halides present in the discharge chamber.

Metal halide lamp with trace T1I filling for improved dimming properties

A metal halide lamp having excess amount of red radiation, well beyond a tungsten halogen lamp of the same color temperature. The deep saturated red being accomplished with reasonable efficacy utilizing a mixture of sodium and rare earth halides, additional broadening of the Na &ldquo;D&rdquo; lines and filtering out the yellow radiation at about 590 nm. The red radiation is comparable to the commercially available white high pressure sodium lamp red radiation.

Metal halide lamp with enhanced red emission, in excess of a blackbody

A thallium-free high pressure ceramic metal halide lamp having superior dimming characteristics with a fill composition comprising MgI and CeI . In addition, the fill chemistry comprises NaI and the halides of rare earth metals such as Dy, Ho and Tm.

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Beverly, MA, United States of America

Stefaan Maria Lambrechts