Abstract: A metal halide arc discharge lamp (10) having a lamp envelope (12) and an arc tube (14) mounted within the envelope; a shroud (20) surrounding the arc tube (14); electrical lead-ins (26, 28) for supplying electrical energy to the arc tube (14); and a chemical fill within the arc tube to produce light when an arc is formed within the arc tube; the improvement comprising: the shroud (20) having a given thickness T and a given inside diameter ID having a relationship such that T is less than 2 mm and ID/T is less than 22.

Abstract: A metal halide arc discharge lamp (10) having a lamp envelope (12) and an arc tube (14) mounted within the envelope; a shroud (20) surrounding the arc tube (14); electrical lead-ins (26, 28) for supplying electrical energy to the arc tube (14); and a chemical fill within the arc tube to produce light when an arc is formed within the arc tube; the improvement comprising: the shroud (20) having a given thickness T and a given inside diameter ID having a relationship such that T is less than 2 mm and ID/T is less than 22.

Abstract: A holder (50) for an arc tube-shroud assembly (52) (see FIGS. 3-5) comprises: a planar disc (54) having a plurality of shroud-holding arms (56) peripherally spaced about the disc and extending in a first direction (58). At least two arc tube holding arms 60 extend in an opposite direction (62) for positioning an arc tube (52a) laterally within a shroud (52b); and at least one arc tube locking tab (64) extends in the opposite direction (60) for positioning the arc tube (52a) axially within the shroud (52b). The planar disc (54) is provided with a plurality of venting apertures (82) sized to allow egress of pressurized gases but inhibit passage of axially-propelled arc tube shards in the event of a non-passive failure of an arc tube.

Abstract: A high pressure sodium lamp (100) having an evacuated glass envelope (6) with a plurality of electrically conductive support members therein and extending therethrough. An elongated arc tube (14) having a pair of electrodes (26) extending therethrough is affixed to the electrically conductive support members within the glass envelope. A gas fill includes a quantity of mercury and sodium within the elongated tube. The arc tube is selected from a translucent material that, when the lamp is operating, will have a wall temperature of about 1250 degrees Celsius, a wall loading of from about 18.9 to about 22.2 w/cm sqr., and a power consumption of from 150 to 400 watts. Further, the amount of mercury is reduced from 14.4 mgs/arc tube to 10.8 mgs/arc tube, allowing lamps having power consumption from 150 to 400 watts to pass the Toxicity Characteristics Leaching Procedure (TCLP).

Abstract: A high pressure sodium lamp (100) having an evacuated glass envelope (6) with a plurality of electrically conductive support members therein and extending therethrough. An elongated arc tube (14) having a pair of electrodes (26) extending therethrough is affixed to the electrically conductive support members within the glass envelope. A gas fill includes a quantity of mercury and sodium within the elongated tube. The arc tube is selected from a translucent material that, when the lamp is operating, will have a wall temperature of about 1250 degrees Celsius, a wall loading of from about 18.9 to about 22.2 w/cm sqr., and a power consumption of from 150 to 400 watts. Further, the amount of mercury is reduced from 14.4 mgs/arc tube to 10.8 mgs/arc tube, allowing lamps having power consumption from 150 to 400 watts to pass the Toxicity Characteristics Leaching Procedure TCLP).

Abstract: An electrode feedthrough assembly for a ceramic arc tube of the type used in high pressure sodium arc lamps. The electrode feedthrough assembly is particularly useful in an external reservoir arc tube wherein an interior region of a feedthrough tube is utilized as a reservoir for the lamp fill material. The electrode feedthrough assembly includes a feedthrough tube, an electrode assembly attached to the feedthrough tube and a connection wire. The feedthrough tube has a closed end external to the arc tube. The feedthrough tube and the closed end thereof are formed in a single process, preferably by deep drawing, without welding, crimping or fusing. Passages to the interior of the feedthrough tube are provided by crimping the electrode support rod to the feedthrough tube with a six jaw crimping arrangement wherein two of the crimping jaws are shorter than the other four. The connection wire is attached to the feedthrough tube and includes a portion on the axis of the tube.

Abstract: An emissive material for use in a vapor discharge device including reacted Ba.sub.x Sr.sub.1-x Y.sub.2 O.sub.4 wherein X satisfies the following: 1>X.gtoreq.0. A vapor discharge device is provided having an arc tube which includes electrodes therein coated with such emissive material.

Abstract: A high pressure metal vapor lamp including an outer protective envelope having a lens and a reflector member having a base for connecting the lamp to a source of electrical power. An elongaated arc tube is provided extending cross-axially relative to the axis of the lamp, the arc tue being supported by leads extending from the base. A pair of barium flash getters is provided extending from respective ends of the arc tube towards, and in close proximity to, the lens and facing the reflector member.