U.S. Philips Corporation

Alexander Gray Jack

Wiggert Kroontje

Peter C Drop

Willy Joseph Endevoets

Franciscus N Baeten

Johannes Van De Bilt

Antonie Peter Van Eijl

A low-pressure sodium vapor discharge lamp having electrodes at the ends of the discharge vessel, the lamp comprising means which prevent the vapor pressure of sodium in the discharge vessel from exceeding 3.times.10.sup.-5 torr during the life of the lamp.

Low-pressure sodium vapor discharge lamp

A high pressure tin halide discharge lamp having a discharge vessel containing a quantity of rare gas as a starter gas and for each cubic cm of contents of the discharge vessel between 0 and 50 mg of mercury and at least 1 .mu.mol of at least one of the halides of tin. Furthermore the discharge vessel contains at least one of the elements indium, bismuth, lead, gallium and zinc or halides thereof to correct the color point of the radiation emitted by the lamp.

High pressure tin halide discharge lamp

A high pressure mercury vapour discharge lamp having a discharge vessel provided with electrodes between which the discharge is maintained during operation and comprising a quantity of rare gas as a starting gas and furthermore between 0.5 and 25 mg of mercury and between 1 and 20 .mu.g mol of at least one of the halides of tin (with the exception of fluoride) per cubic cm of contents of the discharge vessel. To decrease the colour temperature of the radiation emitted by the lamp the discharge vessel is furthermore provided with at least one of the halides of lithium (with the exception of fluoride), while up to a maximum of 50 mol % of lithium halide may be replaced by sodium halide.

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Eindhoven, Netherlands

Alexander Gray Jack