A multi-color micro-LED array light source comprising: a thermally conductive substrate ; multiple arrays of micro-LEDs monolithically integrated on the thermally conductive substrate, wherein the micro-LEDs from all of the arrays in aggregate comprise at least two different color micro-LEDs arranged in an interleaved manner and each array comprises: a plurality of micro-LEDs that are all a same color; a driver input for receiving a driver signal for the plurality of micro-LEDs; and electrical connections that connect the plurality of micro-LEDs to the driver input, wherein the plurality of micro-LEDs are driven in unison by the driver signal; and passive collimation optics integrated on the thermally conductive substrate, the passive collimation optics reducing an angular divergence of output light produced by the LEDs, the passive collimation optics comprising: a reflective cup for collimating light produced by the arrays of micro-LEDs outside a central divergence cone, the arrays of micro-LEDs mounted at a base of the reflective cup with the reflective cup surrounding the arrays of micro-LEDs; and refractive optics positioned inside the reflective cup for collimating light produced by the arrays of micro-LEDs within the central divergence cone, the arrays of micro-LEDs immersed within the refractive optics; wherein the refractive optics includes a refractive lens superimposed on top of a refractive hemisphere with a focal point of the refractive lens coincident with a center of the refractive hemisphere. a thermally conductive substrate ; multiple arrays of micro-LEDs monolithically integrated on the thermally conductive substrate, wherein the micro-LEDs from all of the arrays in aggregate comprise at least two different color micro-LEDs arranged in an interleaved manner and each array comprises: a plurality of micro-LEDs that are all a same color; a driver input for receiving a driver signal for the plurality of micro-LEDs; and electrical connections that connect the plurality of micro-LEDs to the driver input, wherein the plurality of micro-LEDs are driven in unison by the driver signal; and a plurality of micro-LEDs that are all a same color; a driver input for receiving a driver signal for the plurality of micro-LEDs; and electrical connections that connect the plurality of micro-LEDs to the driver input, wherein the plurality of micro-LEDs are driven in unison by the driver signal; and passive collimation optics integrated on the thermally conductive substrate, the passive collimation optics reducing an angular divergence of output light produced by the LEDs, the passive collimation optics comprising: a reflective cup for collimating light produced by the arrays of micro-LEDs outside a central divergence cone, the arrays of micro-LEDs mounted at a base of the reflective cup with the reflective cup surrounding the arrays of micro-LEDs; and refractive optics positioned inside the reflective cup for collimating light produced by the arrays of micro-LEDs within the central divergence cone, the arrays of micro-LEDs immersed within the refractive optics; wherein the refractive optics includes a refractive lens superimposed on top of a refractive hemisphere with a focal point of the refractive lens coincident with a center of the refractive hemisphere. a reflective cup for collimating light produced by the arrays of micro-LEDs outside a central divergence cone, the arrays of micro-LEDs mounted at a base of the reflective cup with the reflective cup surrounding the arrays of micro-LEDs; and refractive optics positioned inside the reflective cup for collimating light produced by the arrays of micro-LEDs within the central divergence cone, the arrays of micro-LEDs immersed within the refractive optics; wherein the refractive optics includes a refractive lens superimposed on top of a refractive hemisphere with a focal point of the refractive lens coincident with a center of the refractive hemisphere. <EOS>