Lighting device with pump light source and phosphor arrangement

1. A lighting device, comprising:

a pump light source;

a phosphor arrangement; and

a light control element arranged between the pump light source and the phosphor arrangement;

wherein the light control element is configured to split the pump light beam into a reflected part and a transmitted part and for controlling the ratio between reflected part and transmitted part; and

wherein the phosphor arrangement comprises at least one phosphor which can be irradiated with at least one of the reflected part and transmitted part of the pump light of the pump light source and emits said pump light again at least partly in a wavelength-converted fashion,

wherein the light control element has a front side and a rear side; and

wherein the front side comprises a region which is designed to be reflective for the pump light.

2. The lighting device of claim 1 ,

wherein the light control element is arranged in such a way that the region of the front side reflects only a part of the impinging pump light onto the phosphor of the phosphor arrangement.

3. The lighting device of claim 1 ,

wherein the region of the front side is designed to be transparent to the wavelength-converted light.

4. The lighting device of claim 1 ,

wherein the front side of the light control element comprises a second region, which is designed to be transparent to the pump light and the wavelength-converted light.

5. The lighting device of claim 1 , further comprising;

one or more further light control elements arranged one behind another in the pump light beam, wherein a phosphor arrangement is assigned to each light control element.

6. The lighting device of claim 1 ,

wherein the rear side of the light control element comprises a region which is designed to be reflective for the wavelength-converted light.

7. The lighting device of claim 1 ,

wherein the rear side of the light control element comprises a region which is designed to be reflective for the pump light.

8. The lighting device of claim 7 ,

wherein a prism is disposed downstream of the light control element and guides that part of the pump light which is transmitted by the light control element back to the reflective region of the rear side of the light control element.

9. The lighting device of claim 1 ,

wherein the phosphor arrangement comprises an optical unit for imaging the pump light onto the phosphor and collecting the wavelength-converted light.

10. The lighting device of claim 1 ,

wherein, for controlling the ratio of reflected to transmitted proportion of the pump light, the light control element is designed to be movable.

11. The lighting device of claim 10 ,

wherein the movability of the light control element is translational, rotary or tilting.

12. A method for operating a lighting device,

the lighting device comprising:

a pump light source;

a phosphor arrangement; and

a light control element arranged between the pump light source and the phosphor arrangement;

wherein the light control element is configured to split the pump light beam into a reflected part and a transmitted part and for controlling the ratio between reflected part and transmitted part; and

wherein the phosphor arrangement comprises at least one phosphor which can be irradiated with the reflected part and/or transmitted part of the pump light of the pump light source and emits said pump light again at least partly in a wavelength-converted fashion;

the method comprising:

controlling a ratio of that part of the pump light which is reflected by the light control element to the transmitted part of the pump light.

13. The method of claim 12 ,

wherein the ratio is controlled by movement of the reflective region of the front side of the light control element into the pump light beam and thus by selection of the size of the irradiated area of the reflective region of the front side of the light control element.

14. The method of claim 12 ,

wherein the phosphor is irradiated with the reflected or transmitted part of the pump light.