Methods and apparatus for generating and modulating illumination conditions

An apparatus for generating essentially white light, comprising:

• at least one first white LED characterized by a first spectrum;
• at least one second white LED characterized by a second spectrum, the first spectrum being substantially different than the second spectrum;
• at least one non-white LED;
• and
• at least one controller adapted to independently control at least a first intensity of first radiation emitted from the at least one first white LED, a second intensity of second radiation emitted from the at least one second white LED, and a third intensity of third radiation emitted from the at least one non-white LED.

A lighting fixture for generating white light, comprising:

• at least one first white LED characterized by a first spectrum;
• at least one second white LED characterized by a second spectrum, the first spectrum being substantially different than the second spectrum;
• and
• at least one third LED characterized by a first chromaticity to the right of the 2300 Kelvin point of a Planckian locus on a conventional chromaticity chart.

A method for generating essentially white light, comprising:

• generating first radiation from at least one first white LED, the first radiation characterized by a first spectrum;
• generating second radiation from at least one second white LED, the second radiation characterized by a second spectrum, the first spectrum being substantially different than the second spectrum;
• and
• combining the first radiation and the second radiation to form a light output.