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US 6,958,575 B2Granted
Metal halide lamp with improved red rendition and CRI
AssigneeKoninklijke Philips Electronics N.V.
InventorsKevin S. Dombrowski, Claudia Alicia Rojas-Cedillo
Life of this patent
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Abstract
A ceramic metal halide arc tube is surrounded by a protective neodymium sleeve supported by a metal frame. As a result of the neodymium sleeve, the lamp is observed to have improved transmission of red color and to exhibit a CRI of at least about 90.
Claims12
A lamp comprising
- a light source having a pair of opposed leads,
- a protective sleeve around the light source, and
- a metal frame supporting said sleeve, wherein the protective sleeve is composed of neodymium.
A lamp comprising
- a light source formed by a metal halide arc tube,
- a protective sleeve around the light source, and
- a metal frame supporting said sleeve, wherein the protective sleeve is composed of neodymium.
A lamp comprising
- a light source formed by a metal halide arc tube,
- a protective sleeve around the light source, said sleeve having a pair of opposed ends,
- a metal frame supporting said sleeve, and
- a glass envelope surrounding the light source, the protective sleeve, and the metal frame,
- wherein the protective sleeve around the light source comprises an effective amount of neodymium to result in an improved CRI when compared to conventional lamps with sleeves that are devoid of neodymium.
2 more elements
Dependencies are inferred from the claim text.