"Typically photoluminescence materials such as phosphors have a yellow to orange appearance and to improve the visual appearance of the component in an off-state the component can further comprise a light diffusive layer on the component. Such light diffusive materials which can include titanium dioxide (TiO.sub.2), barium sulfate (BaSO.sub.4), magnesium oxide (MgO), silicon dioxide (SiO.sub.2) or aluminum oxide (Al.sub.2O.sub.3) preferably have a white appearance thereby lessening the yellow appearance of the component in the off-state.
"In an embodiment the component comprises: a contiguous exterior wall that defines an interior volume; a first opening defined by the contiguous exterior wall; a second opening defined by the contiguous exterior wall, where the second opening is at an opposite end from the first opening; and wherein the first and second openings are smaller than the maximum length across the contiguous exterior wall.
"According to embodiments of the invention a lamp comprises: a thermally conductive body comprising at least one cavity having a first opening positioned on an end surface of the body and a plurality of second openings positioned on another surface of the body; at least one solid-state light emitting device mounted in thermal communication with the end surface of the thermally conductive body; and a duct that extends beyond the at least one solid state light emitting device wherein the duct and cavity define a pathway for thermal airflow through the thermally conductive body. In some embodiments the duct and the body comprise separate components. Alternatively the duct can be formed integrally with the body.
"Preferably the duct comprises a light reflective surface. The light reflective surface can be formed with a light reflective sleeve that is positioned adjacent to the duct. Alternatively the light reflective surface can comprise an outer surface of the duct. Typically the light reflective surface comprises a substantially conical surface.
"In some embodiments the lamp further comprises a photoluminescence wavelength conversion component configured to absorb at portion of light emitted by the at least one light emitting device and to emit light of a different wavelength. Preferably the wavelength conversion component is remote to the at least one solid-state light emitting device. In preferred embodiments the wavelength conversion component in conjunction with the light reflective surface and the end surface of the body defines a volume enclosing the at least one light emitting device. Preferably the wavelength conversion component comprises a substantially toroidal shell or a cylindrical shell.
"The lamp can further comprise a light diffusive component. In some embodiments the light diffusive component in conjunction with the light reflective surface and the end surface of the body defines a volume enclosing the at least one light emitting device. The light diffusive component preferably comprises a toroidal shell. For ease of fabrication and to eliminate the need for a collapsible former during molding of the component, the toroidal shell can comprise two parts that are identical.
"In some embodiments the at least one cavity is coaxial with the thermally conductive body. Typically one or more of the plurality of second openings is positioned on a side surface of the body.
"According to the invention a lamp having an overall length under 150 mm comprises: a base portion and a light emitting portion; wherein the base portion houses a power supply and has a length that is at least 40% of the overall length, where the base portion forms a base heat sink allowing air flow through a base heat sink duct in the base heat sink; and wherein the light emitting portion comprises at least one solid state lighting device and has a length that is less than 60% of the overall length, where the light emitting portion forms a second heat sink that allows air flow through a second duct in the second heat sink.
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