Operating light and a process for lighting an operating table by means of an operating light

1. An operating light comprising:

a radiation source for producing light with a locally different color temperature distribution in a work area, in a plane parallel to a working surface, wherein said locally color temperature distribution has a radially outwardly dropping pattern with a plurality of radial areas of at least one of nearly constant, continuously changing and slightly decreasing color temperature, the plurality of radial areas comprising:

a first area which covers an innermost part of the work area having a color temperature that is nearly constant and has a mean value between 4,500 K and 6,700 K;

a second area, which adjoins the first area, the second area having a color temperature that decreases from an inside of the second area to an outside of the second area; and

a third area, which adjoins the second area, said third area having a mean color temperature value between 3,000 K and 4,000 K.

2. An operating light in accordance with claim 1 , wherein the color temperature in the first area changes by 600 K or less.

3. An operating light in accordance with claim 1 , wherein the color temperature in the second area decreases from the inside of the second area to the outside of the second area by 1,000 K or more.

4. An operating light in accordance with claim 1 , wherein the color temperature in the third area changes by 600 K or less.

5. An operating light in accordance with claim 1 , wherein the first area covers a working position within the work area, wherein the lighting intensity is greater within the first area than outside the first area.

6. An operating light in accordance with claim 1 , wherein a size of the first area is determined by a first area external diameter, at which the lighting intensity drops to 80% to 20% of a maximum first area lighting intensity.

7. An operating light in accordance with claim 1 , wherein a size of the second area is determined by a second area external diameter, at which the lighting intensity has dropped to 15% to 5% of a maximum second area lighting intensity.

8. An operating light in accordance with claim 1 , wherein:

the radiation source comprises an LED chip with a phosphor converter applied in front of the LED chip in an emission direction; and

said phosphor converter is larger than the LED chip in order to locally emit light with different color temperatures.

9. An operating light in accordance with claim 1 , wherein the radiation source comprises an optical system for bundling and imaging a light emission, wherein said optical system is designed such that a local color temperature characteristic is preserved.

10. An operating light in accordance with claim 1 , further comprising at least one additional radiation source to provide a plurality of different radiation sources, wherein homogeneous color temperatures of the radiation sources are superimposed by means of different focus diameters to the local color temperature pattern.

11. An operating light in accordance with claim 1 , further comprising at least one additional radiation source to provide a plurality of radiation sources of a same type, wherein the radiation sources comprise a plurality of LED lens pairs with a radial color temperature pattern oriented towards a light spot at a defined working distance.

12. An operating light in accordance with claim 1 , further comprising at least one additional radiation source to provide a plurality of radiation sources with a lighting means comprising one or more of halogen lights, gas discharge lights and LEDs.

13. An operating light in accordance with claim 1 , further comprising at least one additional radiation source to provide a plurality of radiation sources, each of said radiation sources having a light filter and a reflector arranged one after another in a light body and each of said radiation sources produce a light spot with different, always homogeneous color temperature and different focus diameters at a same working distance on a common axis.

14. An operating light in accordance with claim 1 , wherein:

the first area has a color temperature mean value between 5,200 K and 6,000 K; and

the third area has a mean color temperature value that is between 3,200 K and 3,900 K.

15. An operating light in accordance with claim 6 , wherein the lighting intensity drops to 65% to 35% of the maximum at the first area external diameter.

16. A process for lighting an operating table, the process comprising the steps of:

providing an operating light with a radiation source;

producing light with the radiation source, the light having a locally different color temperature distribution in a work area, in a plane parallel to a working surface, wherein said locally color temperature distribution has a radially outwardly decreasing pattern with a plurality of radial areas of at least one of nearly constant, continuously changing and slightly decreasing color temperature, the plurality of radial areas comprising:

a first area which covers an innermost part of the work area having a color temperature that is nearly constant and has a mean value between 4,500 K and 6,700 K;

a second area, which adjoins the first area, the second area having a color temperature that decreases from an inside of the second area to an outside of the second area; and

a third area, which adjoins the second area, said third area having a mean color temperature value between 3,000 K and 4,000 K.

17. A process in accordance with claim 16 , further comprising:

producing a light spot with a radial color temperature pattern which has a nearly constant color temperature pattern in said first area and, adjoining same, and has a color temperature decreasing towards the edge of the light spot; and

setting the color temperature pattern such that fatigue-free working is made possible during the operation of the operating light.

18. A process in accordance with claim 16 , further comprising:

using physiological light perception during the operation by an operating site being lit with a higher color temperature in order to make high concentration and low fatigue possible, and a lower color temperature is provided outside the operating site in order to create a quieter picture with a lower extent of overstimulation.

19. An operating light for lighting a work area of a working surface of an operating table in an operating room, the operating light comprising:

a radiation source producing light in the work area with a color temperature distribution that differs between local areas in a plane parallel to the working surface, the local areas of the color temperature distribution comprising:

a first area covering an innermost part of the work area and having a color temperature that is nearly constant with a mean value between 4,500 K and 6,700 K;

a second area adjacent to the first area and having a color temperature that decreases from an inside of the second area to an outside of the second area; and

a third area adjacent to the second area and having a mean color temperature value between 3,000 K and 4,000 K.

20. An operating light in accordance with claim 19 , wherein:

the color temperature in the first area changes by 600 K or less;

the color temperature in the second area decreases from the inside of the second area to the outside of the second area by 1,000 K or more;

the color temperature in the third area changes by 600 K or less.