Abstract
A novel secondary optical design for LED lamps with high color rendering indices (CRI) and adjustable correlated color temperature (CCT) is proposed. RGB LED cells are assembled in a three dimensional manner together with a set of beam mixers. Perfect light mixing is resulted by optimizing the structural parameters of the reflectors and beam mixers. A supplement amber LED is used for light compensation. Illuminance and color of the luminaire can both be adjusted. CRI larger than 90 is maintained for a very wide temperature range from 4000K to 6500K. The largest Ra valued up to 93 is obtained at 6276K. Except for its outstanding optical characteristics, the present design is also featured by its advantages in simplifying the heat dissipation design. More LED cells could then be included in a lamp of relative small volume to get higher power.
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