Controlling a lighting device having at least two electric light sources

Patent metadata

Field	Value
Publication number	US-10959305-B2
Application number	US-201816604592-A
Country	US
Kind code	B2
Filing date	Apr 4, 2018
Priority date	Apr 13, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A method may include supplying electric power to a first light source and a second light source of at least two light sources by at least one ballast so that the first light source and the second light source emit a first source light and a second source light with a first and second spectral light distribution, respectively. The method further includes superimposing the first and second source light using an optical unit such that the lighting device outputs light with a spectral superposition light distribution. The method further includes detecting the light outputted from the lighting device using a light distribution sensor that provides a sensor signal corresponding to a spectral light distribution of the detected light. The method further includes comparing the sensor signal to a predefined spectral light distribution and adjusting the electric power supplied to the respective light source by the ballast based on the comparison.

First claim

The invention claimed is:

1. A method for controlling a lighting device comprising at least two electric light sources, wherein the method comprises:
supplying a first electric power to a first light source of the at least two light sources by at least one ballast in order for the first light source of the at least two light sources to emit a first source light with a first spectral light distribution;
supplying a second electric power to a second light source of the at least two light sources by the at least one ballast in order for the second light source of the at least two light sources to emit a second source light with a second spectral light distribution different from the first spectral light distribution;
superimposing the first source light and the second source light from the at least two light sources by an optical unit of the lighting device such that the lighting device outputs light with a spectral superposition light distribution;
detecting at least the light outputted by the lighting device by a light distribution sensor that provides a sensor signal corresponding to a spectral light distribution of the detected light;
comparing the sensor signal to a predefined spectral light distribution;
ascertaining a respective proportion of at least a first light source and a second light source of the at least two light sources in a light flux of the light output by the lighting device; and
adjusting the electric power supplied to the at least the first light source and the second light source of the at least two light sources in a descending order from highest proportion to lowest proportion by the at least one ballast based on the comparison and the ascertained respective proportions of the at least the first light source and the second light source of the at least two light sources.

2. The method according to claim 1 , wherein the adjusting the power supplied to the respective light is based on an operating state stability of the respective light source with respect to the spectral light distribution of the source light output by it.

3. The method according to claim 1 , wherein the adjusting the power supplied to the respective light source is based on a wavelength of an intensity maximum of the spectral light distribution of the source light output by the respective light source.

4. The method according to claim 1 , wherein the adjusting the respective supplied power is based on only a control signal, the amount of which is greater than a predefined minimum value.

5. The method according to claim 1 , wherein the adjusting the respective supplied power is based on individual physical characteristics of the respective light source.

6. The method according to claim 1 , wherein the detecting of the light output by the lighting device includes detecting at least the light output in an area of an object lighted by the lighting device.

7. The method according to claim 1 , wherein the predefined light distribution is based on physical characteristics of the lighted object.

8. The method according to claim 1 , wherein the adjusting the powers supplied to the respective light sources is based on a spectral light distribution of the light detected at the lighted object.

9. The method according to claim 1 , wherein the light distribution sensor is in communication link with a control device for the lighting device.

10. The method according to claim 1 , wherein the light distribution sensor comprises an energy supply unit.

11. The method according to claim 1 , wherein the predefined spectral light distribution is based on a spectral light distribution of the at least first spectral light distribution and second spectral light distribution.

12. The method according to claim 11 , wherein the at least first spectral light distribution and second spectral light distribution are individually detected at the object to be lighted by the light distribution sensor.

13. The method according to claim 1 , wherein the descending order for adjusting the electric power supplied to the at least two light sources occurs based on high wavelength to low wavelengths for the wavelengths of light emitted from the at least two light sources.

14. A control device for controlling a lighting device comprising at least two electric light sources, wherein a first light source of the at least two light sources emits a first source light with a first spectral light distribution based on a supplied first electric power, and a second light source of the at least two light sources emits a second source light with a second spectral light distribution different from the first spectral light distribution based on a supplied second electric power, wherein the first source light and the second source light are superimposed by an optical unit of the lighting device such that the lighting device outputs light with a spectral superposition light distribution, wherein the control device is configured to control at least one ballast of the lighting device such that the first electric power is supplied to the first light source of the at least two light sources and the second electric power is supplied to the second light source of the at least two light sources, wherein the control device comprises:
an evaluation unit having a light distribution sensor for detecting at least the light output by the lighting device, wherein the evaluation unit is configured to receive a sensor signal corresponding to a spectral light distribution of the light detected by the light distribution sensor; wherein the evaluation unit is configured to:
compare the sensor signal to a predefined spectral light distribution;
ascertain a respective proportion of at least a first light source and a second light source of the at least two light sources in a light flux of the light output by the lighting device;
provide at least one control signal for the at least one ballast based on the comparison; and
adjust the electric power supplied to the at least the first light source and the second light source of the at least two light sources in a descending order by the at least one ballast based on the at least one control signal and the ascertained respective proportions of the at least the first light source and the second light source of the at least two light sources.

15. The lighting device comprising the control device according to claim 14 ; wherein the lighting device further comprises:
the first light source of at least two light sources for emitting a first source light with a first spectral light distribution;
the second light source of at least two light sources for emitting a second source light with a second spectral light distribution different from the first spectral light distribution;
the at least one ballast configured to supply a first electric power to the first light source of the at least two light sources and configured to supply a second electric power to the second light source of the at least two light sources; and
the optical unit configured to superimpose the source light emitted by the at least two light sources such that the lighting device outputs light with a spectral superposition light distribution.

16. The control device according to claim 14 , wherein the descending order for adjusting the electric power supplied to the at least two light sources occurs based on high wavelength to low wavelengths for the wavelengths of light emitted from the at least two light sources.

Assignees

• Osram Gmbh

Inventors

• Boulouednine Mourad
• Binder Ulrich
• Steyer Michael

Classifications

• H05B47/1965

  using handheld communication devices · CPC title

• H05B47/1985

  Creation of lighting zones or scenes · CPC title

• H05B47/19

  via wireless transmission · CPC title

• G01J3/465

  taking into account the colour perception of the eye; using tristimulus detection · CPC title

• H05B45/20

  Controlling the colour of the light · CPC title