Abstract: A luminaire includes a fixture, a light engine, and a heat flange. The fixture is configured to be received in a recess of a support surface and defines a cavity having a radius R. The light engine is disposed within the cavity and includes at least one light source. The heat flange is disposed about a distal end region of the fixture and includes a hollow, generally conical frustum shape extending radially outwardly from the fixture and extending away from the distal end region of the fixture. A distal-most end of the heat flange is configured to be disposed a distance D from the support surface when the fixture is received in the recess, the distance D being greater than or equal to 0.4R. Thermal energy is conductively transferred from the light engine, through the fixture, to the heat flange where the thermal energy is convectively transferred from the heat flange to surrounding air to create air currents flowing along the support surface thereby reducing the junction temperature.

Abstract: A lighting system includes a heat sink having an upper and a lower face, and a plurality of light engines. The heat sink includes a plurality of individual, enclosed heat conduits extending generally parallel to a longitudinal axis of the heat sink between the upper and the lower faces. Each heat conduit has an entrance proximate to the lower face and an exit proximate to the upper face. The light engines are each coupled to at least one heat conduit such that thermal energy generated by the light engines is transferred to the heat conduits to cause air to flow through each of the heat conduits due to convection.

Abstract: A rectangular luminaire includes a rectangular fixture defining at least one cavity having a plurality of light engines. A heat flange is disposed about a distal end region of the rectangular fixture and includes a hollow, generally pyramidal frustum shape with a generally rectangular cross-section. A distal-most end of the heat flange is configured to be disposed a distance D from a support surface when the rectangular fixture is received in a recess of the support surface, the distance D being greater than or equal to 0.4 times the fixture half-width W. Thermal energy is conductively transferred from the light engine, through the rectangular fixture, to the heat flange where the thermal energy is convectively transferred from the heat flange to surrounding air to create air currents flowing along the support surface thereby reducing the junction temperature.

Abstract: A rectangular luminaire includes a rectangular fixture defining at least one cavity having a plurality of light engines. A heat flange is disposed about a distal end region of the rectangular fixture and includes a hollow, generally pyramidal frustum shape with a generally rectangular cross-section. A distal-most end of the heat flange is configured to be disposed a distance D from a support surface when the rectangular fixture is received in a recess of the support surface, the distance D being greater than or equal to 0.4 times the fixture half-width W. Thermal energy is conductively transferred from the light engine, through the rectangular fixture, to the heat flange where the thermal energy is convectively transferred from the heat flange to surrounding air to create air currents flowing along the support surface thereby reducing the junction temperature.

Abstract: A luminaire includes a fixture, a light engine, and a heat flange. The fixture is configured to be received in a recess of a support surface and defines a cavity having a radius R. The light engine is disposed within the cavity and includes at least one light source. The heat flange is disposed about a distal end region of the fixture and includes a hollow, generally conical frustum shape extending radially outwardly from the fixture and extending away from the distal end region of the fixture. A distal-most end of the heat flange is configured to be disposed a distance D from the support surface when the fixture is received in the recess, the distance D being greater than or equal to 0.4R. Thermal energy is conductively transferred from the light engine, through the fixture, to the heat flange where the thermal energy is convectively transferred from the heat flange to surrounding air to create air currents flowing along the support surface thereby reducing the junction temperature.

Abstract: A subassembly (10) for a lamp base, the subassembly (10) has an outer (12) housing having a circumferential wall (14) and a top (16) closing one end (18) of the outer housing (12); at least one lamp receiving aperture (20) in the top (16); and an inner housing (22) contiguous with an entire inside surface (24) of the outer housing (12), the outer housing (12) being a metallic material and the inner housing (22) comprising a plastic material.

Abstract: A subassembly (10) for a lamp base, the subassembly (10) has an outer (12) housing having a circumferential wall (14) and a top (16) closing one end (18) of the outer housing (12); at least one lamp receiving aperture (20) in the top (16); and an inner housing (22) contiguous with an entire inside surface (24) of the outer housing (12), the outer housing (12) being a metallic material and the inner housing (22) comprising a plastic material.

Abstract: A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.

Abstract: A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.

Abstract: A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.