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US 6,724,147 B2Granted
High-pressure gas discharge lamp with cooling arrangement
AssigneeKoninklijke Philips Electronics N.V.
InventorsHolger Moench, Hanns Ernst Fischer
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AssigneeKoninklijke Philips Electronics N.V.
InventorsHolger Moench, Hanns Ernst Fischer
Estimating the term…
A high-pressure gas discharge lamp with a cooling arrangement is described, which is characterized in particular in that the lamp can be operated at an increased power, an increase in the temperature of the coldest spot in the lamp interior generating a higher gas pressure, while the cooling arrangement (7, 71, 83, 82) is constructed and dimensioned such that a devitrification of the lamp bulb and a condensation of the filling gas are substantially prevented at said increased power. A lighting unit with such a high-pressure gas discharge lamp is further described, as is a power supply unit for operating the lamp. This not only considerably improves the spectral properties of the light, but the lamp also operates at a higher operating voltage because of the higher gas pressure, so that a correspondingly higher lamp power is achieved for a given lamp current. On the other hand, given the same lamp power, a weaker current is required, so that the electrodes will have a substantially longer useful life. All this is achieved without any change in the geometry of the lamp.
A high-pressure gas discharge lamp with a cooling arrangement, wherein the lamp can be operated at an increased power level such that an increased gas pressure is generated by an increase in the temperature in the lamp interior, while the cooling arrangement is positioned and dimensioned such that a devitrification of the lamp bulb and a condensation of the filling gas are substantially prevented at said increased power level.
A lighting unit comprising:
A high-pressure gas discharge lamp comprising a cooling arrangement, wherein the lamp can be operated at an increased power level such that an increased gas pressure is generated by an increase in the temperature in the lamp interior, the cooling arrangement directing a flow of cooling agent toward an outer surface of a wall of the lamp enclosing a burner space, one or more electrodes being arranged in the burner space, and a temperature difference between two points on a surface of the wall being maintained in operation of the lamp, the temperature difference corresponding to a second temperature difference between a first temperature of the wall at which devitrification of the wall occurs and a second temperature of the wall at which a condensation of a filling gas of the lamp is substantially prevented.
Dependencies are inferred from the claim text.