The invention relates to a lamp ( 1 ) comprising a light source ( 2 ) that can be excited by microwaves to provide illumination and a housing ( 4 ) surrounding the light source, said housing having at least one light exit opening ( 5 ). The light exit opening ( 5 ) has associated therewith a grille structure ( 6 ) or a labyrinth structure ( 7 ) acting as a microwave shield.
1. A lamp comprising a light source that can be excited by microwaves to provide illumination and a housing surrounding the light source, said housing having at least one light exit opening, characterized in that the light exit opening has associated therewith a labyrinth structure acting as a microwave shield, said labyrinth structure being configured as a labyrinth panel comprising a plurality of labyrinth passages which extend at an oblique angle relative to the light exit direction, wherein light beams emitted by the light source travel through a housing interior, the labyrinth structure, and the light exit opening, wherein the plurality of labyrinth passages has a length that varies between the housing interior and the light exit opening.
2. The lamp according to claim 1 , characterized in that the labyrinth structure is arranged in the housing interior in front of a light-transparent cover, when seen in the light exit direction, said light-transparent cover being in particular a glass or quartz plate.
3. The lamp according to claim 1 , characterized in that the microwave shield is configured as an edge filter or a blocking filter.
4. The lamp according to claim 1 , wherein the length of the plurality of labyrinth passages varies by increasing from a middle central axis in an outward direction toward the light exit opening.
5. The lamp according to claim 1 , wherein the plurality of labyrinth passages has a middle central axis, wherein the middle central axis is an axis of symmetry for the plurality of labyrinth passages.
6. The lamp according to claim 1 , characterized in that the light source has associated therewith a light reflection unit for deflecting light beams, which are emitted by said light source, substantially in the direction of the light exit opening.
7. The lamp according to claim 1 , characterized in that the labyrinth panel is arranged on a back of the light-transparent cover, said back facing the light source.
8. The lamp according to claim 1 , characterized in that the labyrinth panel is arranged such that it is exchangeable.
9. The lamp according to claim 1 , wherein the plurality of labyrinth passages comprise at least one wall, wherein the at least one wall comprises a reflective material.
10. The lamp according to claim 9 , wherein the plurality of labyrinth passages comprise at least one wall, wherein the at least one wall comprises metal.
11. The lamp according to claim 1 , wherein the plurality of labyrinth passages comprise at least one wall, wherein the at least one wall has a diameter that substantially prevents passage of microwave radiation therethrough.