Abstract: A lamp (10) includes a housing (12) with a light source (30, 32) disposed within the housing. Two or more light modulating elements (80, 82, 84, 86) are associated with different components of the lamp, such as a reflector housing (70), an envelope (36), a lens (74), and a shroud (76). Each of the light modulating elements modulates the visible light emitted by the source intermediate the source and an exterior of the housing. One of the light modulating elements modulates light in at least one region of the visible portion of the electromagnetic spectrum differently from another of the light modulating elements. In this way, the light emitted by the source may be tailored by using different properties of each of the light modulating elements.

Abstract: An improved seal for an electric lamp is provided. An oxidation-resistant coating is provided on the current conductor where the outer lead joins the seal foil, preferably at the pinch seal. The coating is preferably a chromium layer covered by a chromium layer or a silver layer covered by a layer of hydrogenated silicon oxy carbon polymer. The coating is preferably applied via sputtering where the coating is subject to high energy electron or ion bombardment during sputtering. Preferably the coating is applied via sputtering at increased deposition pressure.

Abstract: A metal halide lamp (10) includes a light-transmissive envelope (12) which encloses a metal halide pool (30) for generating a discharge when spaced apart electrodes (20, 22) within the envelope are supplied with an electric current. A multi-layer coating (40) is deposited on a surface (42) of the envelope. The coating includes several layers of at least two materials of different refractive index, which, in combination, reflect radiation in the UV region of the electromagnetic spectrum. Rather than optimizing the coating for a normal (i.e., 0°) angle of incidence on the coating, the multi-layer coating is optimized at an angle which is selected to be within 10° of the mean angle (?) of incidence of the UV radiation on the arctube surface, thereby increasing the amount of UV radiation which is returned to the metal halide pool.

Abstract: A reflector lamp has a generally parabolic shaped housing (12) with an interior surface coated with a layer (14) of silver having a protective layer (16) of a stable protective material, such as silica, disposed thereon. The thickness of the protective layer is selected such that at least one of the following relationships is satisfied: a color correction temperature of the lamp is no less than about 60K below that of the light source, and a % reflectance of the reflective interior surface is no less than about 3% below that of an equivalent reflective interior surface without the protective layer.

Abstract: A shroud (26) for a light producing element (46). The shroud having an elongated reflecting portion (20) with a curved cross-section and an elongated light-transmissive portion (24) with a curved cross-section. A cavity in which the light producing element is disposed is formed between the reflecting portion and the light-transmissive portion. A lamp (40) having a shroud (26) according to the invention is also disclosed as is a method of fabricating a shroud according to the invention.