Patent ID: 8018139

Claim:
A method of manufacturing a light emitting diode (LED) light engine, comprising: providing a substrate for supporting the LED light engine; forming conductive traces over the substrate using a film screen printing, physical vapor deposition (PVD), chemical vapor deposition (CVD), electrolytic plating, printed circuit board fabricating, or electroless plating process; mounting a plurality of red LEDs and a plurality of blue LEDS to the substrate with electrical connection to the conductive traces to provide the LED light engine consisting of red LEDs and blue LEDs; disposing a yellow phosphor coating compound over a portion of the substrate away from the blue LEDs and a portion of the blue LEDs constituting less than all of the blue LEDs, the concentration of the yellow phosphor coating compound being selected to allow emission of yellow spectrum light energy from the portion of the blue LEDs covered by the yellow phosphor coating compound; and combining emission of red spectrum light energy from the red LEDs and emission of blue spectrum light energy from a portion of the blue LEDs absent the yellow phosphor coating compound and the emission of yellow spectrum light energy from the blue LEDs covered by the yellow phosphor coating compound to produce a white light having a target correlated color temperature (CCT) in the range of 2700K to 5000K and a target color rendering index (CRI) for the LED light engine.