Method and apparatus for setting a chromaticity coordinate

1. A method for setting a color locus of a luminaire comprising at least one phosphor-converted light-emitting diode and at least one monochromatic light-emitting diode, wherein the method comprises the steps of:

setting a current for the at least one phosphor-converted light-emitting diode;

setting a pulse width modulation for the at least one phosphor-converted light-emitting diode; and

setting a current or a pulse width modulation for the at least one monochromatic light-emitting diode.

2. The method of claim 1 , wherein the color locus is set depending on a setpoint color locus.

3. The method of claim 2 , further comprising:

measuring an actual value of a color locus of the luminaire by at least one sensor;

determining a difference between the actual value and the setpoint color locus; and

adjusting the pulse width modulation for the at least one phosphor-converted light-emitting diode and the current or a pulse width modulation for the at least one monochromatic light-emitting diode based upon the difference determined so that the setpoint color locus is achieved.

4. The method of claim 3 , wherein the at least one sensor comprises an optical sensor.

5. The method of claim 3 , wherein the actual value is determined

in accordance with a CIE CxCy color space,

in accordance with a CIE uv color space,

in accordance with a CIE u′v′ color space and/or

in accordance with a tristimulus XYZ space.

6. The method of claim 3 , wherein the actual value is converted into the following regulation parameters for setting the color locus:

the current for the at least one phosphor-converted light-emitting diode;

the pulse width modulation for the at least one phosphor-converted light-emitting diode; and

the current for the at least one monochromatic light-emitting diode.

7. The method of claim 3 , wherein the actual value is converted into the following regulation parameters for setting the color locus:

the current for the at least one phosphor-converted light-emitting diode;

the pulse width modulation for the at least one phosphor-converted light-emitting diode; and

the pulse width modulation for the at least one monochromatic light-emitting diode.

8. The method of claim 3 , wherein the at least one sensor comprises a temperature sensor.

9. The method of claim 1 , wherein the color locus is set by a lookup table.

10. The method of claim 1 , wherein the phosphor-converted light-emitting diode emits light in at least one of the following colors:

white light,

violet light,

greenish light, and

reddish light.

11. The method of claim 1 , wherein the monochromatic light-emitting diode is a red light-emitting diode.

12. The method of claim 1 , wherein the color locus is set depending on a threshold value around the setpoint color locus.

13. The method of claim 1 , wherein the at least one monochromatic light-emitting diode is set with pulse width modulation.

14. An apparatus for setting a color locus of a lamp or luminaire comprising:

at least one phosphor-converted light-emitting diode;

at least one monochromatic light-emitting diode;

a control unit, which detects a brightness and/or a temperature of the light-emitting diodes via at least one sensor and drives a driver in such a way that:

a current can be set for the at least one phosphor-converted light-emitting diode;

a pulse width modulation can be set for the at least one phosphor-converted light-emitting diode; and

a current or a pulse width modulation can be set for the at least one monochromatic light-emitting diode.

15. The apparatus of claim 14 , wherein the control unit comprises a microcontroller or a processor.

16. A lamp or luminaire comprising the apparatus of claim 14 .

17. The apparatus of claim 14 , wherein the sensor detects a brightness of the light-emitting diodes.

18. The apparatus of claim 14 , wherein the sensor detects a temperature of the light-emitting diodes.

19. The apparatus of claim 14 , wherein the at least one monochromatic light-emitting diode is set with pulse width modulation.