Illumination device with light emitting diodes and moveable light adjustment member

A light emitting diode illumination device comprising:

• a light mixing cavity configured to surround at least one light emitting diode such that light emitted from the at least one light emitting diode directly enters the light mixing cavity, the light mixing cavity comprising a top surface area, a bottom surface area, and a side surface area;
• a first type of wavelength converting material covering a first wavelength converting area of the light mixing cavity;
• and
• a moveable color adjustment member positioned to alter exposure of the first wavelength converting area to the light emitted from the at least one light emitting diode, wherein the moveable color adjustment member is positioned in one of a center of the light mixing cavity extending towards an output port, and around a perimeter of the light mixing cavity.

A method comprising:

• collecting an amount of light emitted from at least one light emitting diode into a light mixing cavity, the light mixing cavity configured to surround the at least one light emitting diode such that the amount of light emitted from the at least one light emitting diode directly enters the light mixing cavity, the light mixing cavity comprising a top surface area, a bottom surface area, and a side surface area, a first type of wavelength converting material covering a first wavelength converting area of the light mixing cavity;
• positioning a movable color adjustment member relative to the at least one light emitting diode to alter exposure of the first wavelength converting area to light emitted from the at least one light emitting diode, wherein the moveable color adjustment member is positioned in one of a center of the light mixing cavity extending towards an output port, and around a perimeter of the light mixing cavity;
• and
• transmitting light from the light mixing cavity through an output port of the light mixing cavity.