Efficient LED-based illumination modules with high color rendering index

An apparatus, comprising:

• at least one Light Emitting Diode (LED) operable to emit a first colored light characterized by an emission spectrum with a peak wavelength between 380 nanometers and 490 nanometers;
• and
• a primary light mixing cavity operable to convert the first colored light to a second colored light, the primary light mixing cavity comprising,
• an output window that is physically separated from the LED that emits the second colored light from the primary light mixing cavity, and
• a sidewall that is physically separated from the LED,
• wherein any of the output window and the sidewall include a first, second, and third photo-luminescent material, wherein a peak emission wavelength of each of the first, second, and third photo-luminescent materials is at least thirty five nanometers from the peak emission wavelengths of the other photo-luminescent materials and no more than one hundred and fifty nanometers from the peak emission wavelengths of the other photo-luminescent materials.

An apparatus, comprising:

• at least one Light Emitting Diode (LED) operable to emit a first colored light characterized by an emission spectrum with a peak wavelength between 380 nanometers and 490 nanometers;
• and
• a primary light mixing cavity operable to convert the first colored light to a second colored light, wherein a spectral response of the second colored light is within 20% of a blackbody radiator of the same correlated color temperature for wavelengths between 500 and 650 nanometers, the primary light mixing cavity comprising,
• an output window that is physically separated from the LED that emits the second colored light from the primary light mixing cavity, and
• a sidewall that is physically separated from the LED,
• wherein any of the output window and the sidewall include a first and second photo-luminescent material.