Triple-enveloped metal-halide arc discharge lamp having lower color temperature
First Claim
1. A metal-halide arc-discharge lamp comprising:
- means for providing a correlated color temperature of approximately 3,600 degrees Kelvin or less and a luminous efficacy of approximately 90 lumens per watt or higher, said means including in combination;
(a) a first light-transmissive envelope being a metal-halide arc tube;
(b) a second light-transmissive envelope hermetically enclosing said arc tube, the atmosphere within said second envelope and outside said arc tube being a vacuum;
(c) a third light-transmissive envelope being an outer envelope, said third envelope hermetically enclosing said second envelope, the atmosphere within said third envelope and outside said second envelope being inert with respect to internal lamp parts, said third envelope being light-transmissive through substantially all of the surface of said third envelope; and
(d) means for structurally and electrically completing said lamp.
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Accused Products
Abstract
A commercially feasible triple-enveloped metal-halide arc-discharge lamp having a hermetically sealed light-transmissive enclosure surrounding the arc tube and a hermetically sealed light-transmissive outer envelope. There is a vacuum within the enclosure and outside the arc tube. There is a gaseous fill within the outer envelope and outside the enclosure. Preferably, metal frame parts within the outer envelope are electrically isolated from the electrical circuit of the lamp in order to minimize sodium loss from the arc tube and providing superior luminous maintenance. The vacuum enclosure about the arc tube eliminates convective heat loss and redistributes reflected heat back to the arc tube such that arc tube operation is hotter and more nearly isothermal. As a result, lamp performance characteristics are comparable or improved with respect to double-enveloped prior art counterparts. Color temperature is substantially reduced. The enclosure acts as an effective containment device in the rare event of a burst of the arc tube. The gaseous fill within the outer envelope minimizes the implosion hazard. A triple-enveloped lamp in accordance with the invention is particularly well suited for high-wattage applications.
11 Citations
8 Claims
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1. A metal-halide arc-discharge lamp comprising:
means for providing a correlated color temperature of approximately 3,600 degrees Kelvin or less and a luminous efficacy of approximately 90 lumens per watt or higher, said means including in combination; (a) a first light-transmissive envelope being a metal-halide arc tube; (b) a second light-transmissive envelope hermetically enclosing said arc tube, the atmosphere within said second envelope and outside said arc tube being a vacuum; (c) a third light-transmissive envelope being an outer envelope, said third envelope hermetically enclosing said second envelope, the atmosphere within said third envelope and outside said second envelope being inert with respect to internal lamp parts, said third envelope being light-transmissive through substantially all of the surface of said third envelope; and (d) means for structurally and electrically completing said lamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification
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- Resources
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Current AssigneeGTE Products Corporation
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Original AssigneeGTE Products Corporation
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InventorsHunter, Scott R.
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Primary Examiner(s)O SHEA, SANDRA L
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Application NumberUS07/762,155Time in Patent Office231 DaysField of Search313/25, 313/634US Class Current313/25CPC Class CodesH01J 61/34 Double-wall vessels or cont...H01J 61/50 Auxiliary parts or solid ma...H01J 61/52 Cooling arrangements; Heati...
