Light source and illuminating device

A light source, comprising:

• a light emitting diode (LED) array, the LED array including at least two types of LED units emitting different color lights, each LED unit including an LED chip;
• wherein a light emitting surface of each LED chip is covered by a high-refractive index transparent medium having a refractive index greater than 1.3, the high-refractive index transparent medium having a wavelength conversion material mixed therein, wherein the high-refractive index medium has a thickness less than 50% of a diameter of a bounding circle of the light emitting surface of the LED chip;
• a collimator array, including at least one collimator unit, wherein each collimator unit corresponds to at least one LED unit, for collimating a light emitted from the at least one LED unit while maintaining an etendue of the light from the at least one LED unit substantially unchanged;
• and
• a light homogenizing device for smoothing a light from the collimator array.

An illumination device comprising:

• a light emitting diode (LED) array, the LED array including at least two types of LED units emitting two different color lights, each LED unit including an LED chip;
• wherein a light emitting surface of each LED chip is covered by a low-refractive index transparent medium having a refractive index lower than 1.1;
• a collimator array, including at least one collimator unit, wherein each collimator unit corresponds to at least one LED unit, for collimating a light emitted from the at least one LED unit while maintaining an etendue of the light from the at least one LED unit substantially unchanged;
• a lens support structure including a lens support frame located around each LED chip, wherein the collimator unit corresponding to each LED unit is mounted on the lens support frame with the low-refractive index transparent medium located between the collimator unit and the light emitting surface of the LED chip;
• a light homogenizing device for smoothing a light from the collimator array;
• and
• a control device, for respectively and independently controlling on and off and input powers of each type of LED units emitting one color light.