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A heat transfer system includes a wick, a vacuum pump and a heat exchanger. The wick receives a condensed liquid. The wick receives heat from a heat source. The vacuum pump reduces pressure in the wick while turned on, so that at least a portion of the liquid evaporates within the wick to form a vap

A heat transfer system includes a wick, a vacuum pump and a heat exchanger. The wick receives a condensed liquid. The wick receives heat from a heat source. The vacuum pump reduces pressure in the wick while turned on, so that at least a portion of the liquid evaporates within the wick to form a vapor that is pumped by the pump. The heat exchanger is coupled to receive the vapor from the pump. The heat exchanger rejects heat to form the condensed liquid from the vapor. The heat exchanger returns the condensed liquid to the wick.

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A heat transfer system includes a wick, a vacuum pump and a heat exchanger. The wick receives a condensed liquid. The wick receives heat from a heat source. The vacuum pump reduces pressure in the wick while turned on, so that at least a portion of the liquid evaporates within the wick to form a vap

A heat transfer system includes a wick, a vacuum pump and a heat exchanger. The wick receives a condensed liquid. The wick receives heat from a heat source. The vacuum pump reduces pressure in the wick while turned on, so that at least a portion of the liquid evaporates within the wick to form a vapor that is pumped by the pump. The heat exchanger is coupled to receive the vapor from the pump. The heat exchanger rejects heat to form the condensed liquid from the vapor. The heat exchanger returns the condensed liquid to the wick. se position determines an open diameter of said iris, and wherein said driven piece includes a bearing surface, and an extending driven part extending from said bearing surface. 8. An apparatus as in claim 7, wherein said extending part includes a spring mounted screw, which is held under pressure by a spring, and pressed against the bearing surface. 9. An apparatus as in claim 8, further comprising a shoulder part, coupled between said screw and said spring, to be held again said bearing surface. 10. An apparatus as in claim 7, wherein said bearing surface is an outer surface of the iris. 11. An apparatus as in claim 6, further comprising a pulley assembly, connected to said iris, to move said iris into a different position. 12. An apparatus as in claim 11, wherein said pulley assembly includes a motor that is rotated to move said pulley assembly in two different directions. 13. An apparatus, comprising: a pixel level controllable device; a processor, forming images used for controlling said pixel level controllable device, to automatically calculate a maximum outer size of said images; and a variable diameter part, controlled based on said maximum outer size of an image that is calculated by said processor. 14. An apparatus as in claim 13, wherein said pixel level controllable device is a digital mirror device. 15. An apparatus as in claim 14, wherein said processor is a digital signal processor. 16. An apparatus as in claim 14, wherein said variable diameter part includes an iris, which has a part that is rotated to change the variable diameter. 17. An apparatus, comprising: a pixel level controllable device; a processor, forming images used for controlling said pixel level controllable device, to automatically calculate a maximum outer size of said images; and a variable diameter part, controlled based on said maximum outer size of an image that is calculated by said processor said variable diameter part including an iris, which has a part that is rotated to change the variable diameter, and wherein said iris includes a movable part, that is moved to change a passing diameter of said iris, an outer bearing surface, and an extending part extending from said an outer bearing surface and connected to said movable part, said extending part including a shoulder part pressing again said bearing surface. 18. An apparatus as in claim 17, further comprising a spring, pressing against said shoulder part, to maintain a pressure of said shoulder part against said outer bearing surface. 19. A lighting apparatus, comprising: a lighting system, including a processor, programmed to produce information about a plurality of different light shapes, a digital mirror device, controlled by said processor to produce a reflection pattern indicative of a selected one of said light shapes, and a lighting element, producing a light beam which is shaped by said digital mirror device, said processor automatically determining an outer size of a light shape which is selected, and producing a signal that automatically controls said iris based on said size; and an electronically controllable iris device, controlled to pass a variable diameter of light based on an applied electronic control signal. 20. An apparatus as in claim 19, further comprising a controller, allowing commands to be entered, and wherein said controller allows entry of a command that controls said electronic control signal that controls the diameter of said iris. 21. An apparatus as in claim 19, wherein said size is a smallest possible size that the iris can have in order to still allow the entire image to pass. 22. An apparatus as in claim 19, further comprising storing a library of images to be used with said digital mirror device, and storing a signal indicative of a diameter for said iris device associated with each of said images. 23. An apparatus as in claim 19, wherein said iris device includes a part that is rotated to change a diameter of light that is pas