Arrangements of solid state light sources for color-mixing, and light sources including the same, are provided. A substrate has and a plurality of different color LED chips coupled thereto. The emitted light is mixed to produce a white light output. The LED chips are arranged on the substrate in a manner that improves color-mixing, for example, by forming LED sets including one or more LED chips of different colors, by skewing the LED chips, and/or by forming a non-rectangular array or a circular array of LED sets and/or chips. The color-mixing LED arrangement may be used in a lamp or other light source together with collimating optics to collimate and further mix the color-mixed light output from the LED arrangement. The color-mixing LED arrangement may be provided as a single package with multiple LED chips or as multiple packages of one or more LED chips.
STATEMENT OF GOVERNMENT INTEREST
 This invention was made with U.S. Government support under DOE Cooperative Agreement No. DE-EE0000611, awarded by the U.S. Department of Energy. The U.S. Government may have certain rights in this invention.