Patent ID: 7852530

Claim:
An illumination source, comprising: a first terminal, a second terminal, and a third terminal; and, a plurality of groups of serially-coupled light emitting diodes (LEDs) including a first group of serially-coupled LEDs and a second group of serially-coupled LEDs, the LEDs in each group having an emission-spectrum that is common to that group, and at least one group having a different emission-spectrum from at least one other group, wherein at least one group of LEDs has a different number of LEDs than at least one other group, wherein the LEDs of the first group of serially-coupled LEDs include a first LED having an anode and a cathode and a second LED having an anode and a cathode, the cathodes of the first and the second LEDs directly connected to the first terminal, wherein the LEDs of the second group of serially-coupled LEDs include a third LED having an anode and a cathode and a fourth LED having an anode and a cathode, the anodes of the third and the fourth LEDs directly connected to the first terminal, wherein the second terminal is directly connected to the anode of the first LED and to the cathode of the third LED, and wherein the third terminal is directly connected to the anode of the second LED and to the cathode of the fourth LED.