Lighting device, method and light wavelength conversion wheel assembly for color tuning thereof

A lighting device, comprising:

• a light source;
• a light output port;
• a light guiding device for guiding the light from the light source to the light output port;
• wherein the light source includes:
• an excitation light source for providing an excitation light;
• and
• a moving unit, wherein the moving unit includes a wavelength conversion wheel assembly which includes:
• a heat dissipating base having a plurality of segments, at least two segments each carrying a wavelength conversion material, the at least two segments being spatially separated and not contacting each other, and a mounting device for supporting the heat dissipating base to rotate around a rotation axis, wherein the heat dissipating base is controlled to rotate intermittently or to predetermined angles, wherein the heat dissipating base faces the excitation light and is partially illuminated by the excitation light, wherein an area of illumination is no greater than an area of any one of the segments;
• a filter plate having a size substantially identical to a size of the plurality of segments of the heat dissipating base;
• a second wheel carrying the filter plate;
• and
• a control unit for controlling a movement of the wavelength conversion wheel assembly so that a selected one of the plurality of segments of the heat dissipating base is illuminated by the excitation light to generate an output light,
• wherein the control unit controls a movement of the second wheel to move the filter plate in and out of an optical path between the heat dissipating base and the light guiding device.

A color tuning method for a lighting device, wherein the lighting device comprises a light source, a light output port, and a light guiding device for guiding the light from the light source to the output port, wherein the light source includes an excitation light source for providing an excitation light, the method comprising:

• providing a moving unit, wherein the moving unit includes a wavelength conversion wheel assembly which includes:
• a heat dissipating base having a plurality of segments, at least two segments each carrying a wavelength conversion material, the at least two segments being spatially separated and not contacting each other, and a mounting device for supporting the heat dissipating base to rotate around a rotation axis, wherein the heat dissipating base is controlled to rotate intermittently or to predetermined angles, wherein the heat dissipating base faces the excitation light and is partially illuminated by the excitation light, wherein an area of illumination is no greater than an area of any one of the segments;
• operating a control unit to control the wavelength conversion wheel assembly, wherein the wavelength conversion wheel assembly moves so that a selected one of the plurality of segments is disposed in an illumination path of the excitation light;
• generating an output light of a selected color, wherein the color of the output light is determined by the excitation light source and the selected segment or the wavelength conversion material carried by the selected segment;
• and
• operating the control unit to control the excitation light and the moving unit in a synchronized manner.