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An electrical device, preferably a light bulb having an electrical base, comprises a container having a sealed interior, an electrical component contained within the sealed interior; a liquid filling the sealed interior; and a pressure relief member. The pressure relief member has an interior tubula

An electrical device, preferably a light bulb having an electrical base, comprises a container having a sealed interior, an electrical component contained within the sealed interior; a liquid filling the sealed interior; and a pressure relief member. The pressure relief member has an interior tubular passage. The tubular passage has an inlet which is in fluid communication with the liquid. The tubular passage is filled with liquid from the inlet partially toward an outer end of the passage. The remainder of the passage is filled with gas. The pressure relief member provides relief from increases of pressure caused by heating the liquid. Preferably, a heat sink is provided for the electrical component and contacts the liquid coolant. The pressure relief member may be located either in the sealed interior or outside of the container.

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1. An electric device comprising: a container having a sealed interior, an electrical component contained within said interior which in operation generates heat; a liquid coolant filling said interior; and a pressure relief member having an interior tubular passage, said tubular passage having an in

1. An electric device comprising: a container having a sealed interior, an electrical component contained within said interior which in operation generates heat; a liquid coolant filling said interior; and a pressure relief member having an interior tubular passage, said tubular passage having an inlet which is in fluid communication with said liquid; wherein said tubular passage is always partially filled with liquid extending from said inlet partially toward an outer end of said passage, wherein the remainder of said passage is filled with gas, and wherein the liquid inside the tubular passage contacts the gas and forms a meniscus at the liquid/gas interface. 2. The electrical device of claim 1, further comprising a heat sink having a portion coupled to said electrical component and another portion in contact with said liquid coolant. 3. The electrical device of claim 1, wherein said expansion member is an expansion tube located exterior to said container. 4. The electrical device of claim 3, wherein said expansion tube has an outer end which is closed. 5. The electrical device of claim 3, wherein said expansion tube has an outer end which is open, wherein said expansion tube has sufficient length to prevent liquid from overflowing said outer end. 6. The electrical device of claim 2, wherein said expansion tube has an outer end, and further comprising an expansion chamber which is in fluid communication with said outer end. 7. The electrical device of claim 3, wherein said expansion tube wraps helically about a portion of said container and has an outer end which is closed. 8. The electrical device of claim 1, wherein said expansion member comprises a frusto-conical member having a longitudinal axis, a shell, and an inner core member; wherein said tubular passage is located on an outer surface of said core member, and extends beneath said shell helically from said inlet in an axial direction. 9. The electrical device of claim 3, wherein said expansion member is an expansion tube located within said interior; wherein said expansion tube has an outer end which is closed; and wherein said passage has a diameter which is small enough to prevent gas from flowing out of said passage into said liquid. 10. A light bulb having a socket and a bulb portion having a sealed interior, at least one LED contained within said interior; a liquid filling said interior; and a pressure relief member having an interior tubular passage, said tubular passage having an inlet which is in fluid communication with said liquid coolant; wherein said tubular passage is always partially filled with liquid which extends from said inlet partially toward an outer end of said passage, wherein the remainder of said passage is filled with gas, and wherein the liquid inside the tubular passage contacts the gas and forms a meniscus at the liquid/gas interface. 11. The light bulb of claim 10, further comprising a heat sink having a portion coupled to said electrical component and another portion in contact with said liquid coolant. 12. The light bulb of claim 10, wherein said expansion member is an expansion tube located exterior to said container. 13. The light bulb of claim 12, wherein said expansion tube has an outer end which is closed. 14. The light bulb of claim 12, wherein said expansion tube has an outer end which is open, wherein expansion tube has sufficient length to prevent liquid from overflowing said outer end. 15. The light bulb of claim 11, wherein said expansion tube has an outer end, and further comprising an expansion chamber which is in fluid communication with said outer end. 16. The light bulb of claim 12, wherein said light bulb includes a bulb portion and a neck portion, and wherein said expansion tube wraps helically about said neck portion and has an outer end which is closed. 17. The light bulb of claim 10, wherein said expansion member comprises a frusto-conical member having a longitudinal axis, a shell, and an inner core member; wherein said tubular passage is located on an outer surface of said core member, and extends beneath said shell helically from said inlet in an axial direction. 18. The light bulb of claim 12, wherein said expansion member is an expansion tube located within said interior; wherein said expansion tube has an outer end which is closed; and wherein said passage has a diameter which is small enough to prevent gas from flowing out of said passage into said liquid coolant. 19. A light-generating device with improved heat sink properties comprising: a container having a sealed interior, a light-generating element contained within said interior; a liquid coolant filling said interior; and a pressure relief member having an interior tubular passage, said tubular passage having an inlet which is in fluid communication with said liquid; wherein said tubular passage is partially filled with liquid extending from said inlet partially toward an outer end of said passage, and wherein the remainder of said passage is filled with gas. 20. The light-generating device of claim 19, wherein said light-generating element is a phosphor material.