Illumination circuit

An illumination circuit, comprising:

• a first voltage source having a first positive electrode and a first negative electrode;
• plural first light-emitting diodes, which are cold color temperature light-emitting diodes, wherein the plural first light-emitting diodes are connected with each other in parallel, and each of the plural first light-emitting diodes has a first input terminal and a first output terminal;
• plural first resistive elements, wherein a first terminal of each first resistive element is connected with the first output terminal of the corresponding first light-emitting diode, and a second terminal of each first resistive element is connected with the first negative electrode of the first voltage source;
• a first impedance element, wherein a first terminal of the first impedance element is connected with the first positive electrode of the first voltage source, and a second terminal of the first impedance element is connected with the first input terminal of each first light-emitting diodes;
• a second voltage source having a second positive electrode and a second negative electrode;
• plural second light-emitting diodes, which are warm color temperature light-emitting diodes, wherein the plural second light-emitting diodes are connected with each other in parallel, and each of the plural second light-emitting diodes has a second input terminal and a second output terminal;
• plural second resistive elements, wherein a first terminal of each second resistive element is connected with the second output terminal of the corresponding second light-emitting diode, and a second terminal of each second resistive element is connected with the second negative electrode of the second voltage source;
• and
• a second impedance element, wherein a first terminal of the second impedance element is connected with the second positive electrode of the second voltage source, and a second terminal of the second impedance element is connected with the second input terminal of each second light-emitting diode.