Patent ID: 7049769

Claim:
An illumination device, comprising: a first (G 1 ) and a second (G 2 ) group of light sources; a circuit arrangement, comprising: a first (CON, PWM 1 ) and a second (CON, PWM 2 ) power supply, wherein: the first power supply (CON, PWM 1 ) supplies power to the first group of light source; and the second power supply (CON, PWM 2 ) supplies power to the second group of light sources; a first (E 1 ) and a second (E 2 ) setting apparatus, wherein: the first setting apparatus (E 1 ) is operable to set a power output of the first (CON, PWM 1 ) and, at the same time, a power output of the second (CON, PWM 2 ) power supply, the first setting apparatus including a first and a second potentiometer, the first and second potentiometer being coupled to each other, wherein the first potentiometer is used to set the power output of the first power supply (CON, PWM 1 ), and the second potentiometer is used to set the power output of the second power supply (CON, PWM 2 ); and the second setting apparatus (E 2 ) is operable to set the power output of only the second power supply (CON, PWM 2 ), the second setting including a potentiometer which is connected in parallel with the second potentiometer of the first setting apparatus (E 1 ); and connection apparatus (S) for coupling the circuit arrangement to the first (G 1 ) and second (G 2 ) group of light sources.