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A lighting device for installation in a substantially plane surface, comprising at least one lamp device that emits light essentially in a light direction which forms an angle with an exit face of a light refracting means in the lamp device. The lamp device comprises a light source that emits light

A lighting device for installation in a substantially plane surface, comprising at least one lamp device that emits light essentially in a light direction which forms an angle with an exit face of a light refracting means in the lamp device. The lamp device comprises a light source that emits light towards an incident face of the light refracting means, where the light refracting means has a longitudinal direction coincident with the light direction, and where the exit face is approximately parallel to the substantially plane surface. The exit face is set a slight angle of inclination relative to the substantially plane surface, the angle and the angle of inclination in combination causing light from the light source to be brought to an emergent angle above the face that satisfies pre-set requirements for light intensity close to the surface.A prism is also described wherein at least the edge formed between the exit face of the prism and a side face which forms an acute angle with the exit face is rounded.

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1. A lighting device for installation in a substantially plane surface, comprising:at least one lamp device that emits light in a light direction which forms an exit angle with an exit face of a single light refracting means, in the lamp device said lamp device comprising a light source that emits l

1. A lighting device for installation in a substantially plane surface, comprising:at least one lamp device that emits light in a light direction which forms an exit angle with an exit face of a single light refracting means, in the lamp device said lamp device comprising a light source that emits light towards an incident face of the light refracting means, and a color filter, wherein the lamp device is in the form of a unit with said light source and said refracting means, wherein the light refracting means has a longitudinal direction coincident with said light direction, and where the exit face is substantially parallel to the substantially plane surface, and that the light refracting means is made of a prism grating, consisting of discs of a glass material and light preventing cover layers placed between the discs, the exit face is set at a slight angle of inclination, relative to the substantially plane surface, the exit angle and the angle of inclination in combination causing light from the light source to be brought to an emergent angle above the surface that satisfies pre-set requirements for light intensity close to the surface. 2. The lighting device according to claim 1, wherein the angle of inclination is from about 2° to about 4°. 3. The lighting device according to claim 1, wherein the angle of inclination is about 3°. 4. A lighting device for installation in a substantially plane surface, comprising:at least one lamp device that emits light essentially in a light direction which forms an exit angle with an exit face of a single light refracting means, in the lamp device said lamp device comprising a light source that emits light towards an incident face of the light refracting means, and a color filter, wherein the lamp device is in the form of a unit with said light source and said refracting means, wherein the light refracting means has a longitudinal direction coincident with said light direction, and wherein the exit face is approximately parallel to the substantially plane surface and that the light refracting means is made of a prism grating, consisting of discs of a glass material and light preventing cover layers placed between the discs, the exit face is set at a slight angle of inclination from about 2° to about 4° relative to the substantially plane surface, the exit angle and the angle of inclination in combination causing light from the light source to be brought to an emergent angle above the surface that satisfies pre-set requirements for light intensity close to the surface. 5. The lighting device for installation in a substantially plane surface, comprising:at least one lamp device that emits light essentially in a light direction which forms an exit angle with an exit face of a single light refracting means, in the lamp device said lamp device comprising a light source that emits light towards an incident face of the light refracting means, and a color filter, wherein the lamp device is in the form of a unit with said light source and said refracting means, wherein the light refracting means has a longitudinal direction coincident with said light direction, and wherein the exit face is approximately parallel to the substantially plane surface and that the light refracting means is made of a prism grating, consisting of discs of a glass material and light preventing cover layers placed between the discs, the exit face is set at a slight angle of inclination of about 3° relative to the substantially plane surface, the exit angle and the angle of inclination in combination causing light from the light source to be brought to an emergent angle above the surface that satisfies pre-set requirements for light intensity close to the surface. 6. The lighting device according to claim 1, wherein the exit angle is from about 48° to about 50°. 7. The lighting device according to claim 2, wherein the exit angle is from about 48° to about 50°. 8. The light ing device according to claim 3, wherein the exit angle is from about 48° to about 50°. 9. The lighting device according to claim 4, wherein the exit angle is from about 48° to about 50°. 10. The lighting device according to claim 5, wherein the exit angle is from about 48° to about 50°. 11. The lighting device according to claim 1, wherein the exit angle is about 48°. 12. The lighting device according to claim 2, wherein the exit angle is about 48°. 13. The lighting device according to claim 3, wherein the exit angle is about 48°. 14. The lighting device according to claim 4, wherein the exit angle is about 48°. 15. The lighting device according to claim 5, wherein the exit angle is about 48°. 16. The lighting device according to claim 1, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 17. The lighting device according to claim 2, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 18. The lighting device according to claim 3, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 19. The lighting device according to claim 4, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 20. The lighting device according to claim 5, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 21. The lighting device according to claim 6, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 22. The lighting device according to claim 11, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face parallel to the inclined plane. 23. The lighting device according to claim 1, in which the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 24. The lighting device according to claim 2, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 25. The lighting device according to claim 3, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a porti on around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 26. The lighting device according to claim 4, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 27. The lighting device according to claim 5, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 28. The lighting device according to claim 6, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 29. The lighting device according to claim 11, wherein the angle of inclination is provided by making an inclined plane in the substantially plane surface, which inclined plane covers a portion around the exit face of the light refracting means, and the light refracting means is arranged with the exit face flush with the inclined plane. 30. The lighting device according to claim 1, further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 31. The lighting device according to claim 2 further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 32. The lighting device according to claim 3 further comprising:a cover having a top face substantially flush with the plane surface, wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 33. The lighting device according to claim 4 further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 34. The lighting device according to claim 5 further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 35. The lighting device according to claim 6 further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 36. The lighting device according to claim 11 further comprising:a cover having a top face substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 37. The lighting device according to claim 23 further comprising:a cover having a top fa ce substantially flush with the plane surface wherein the lamp device is arranged in an opening in the cover, and the lamp device comprises a top face that is arranged to be brought into a substantially flush position relative to the top face of the cover. 38. The lighting device according to claim 16, wherein the inclined plane is made in the top face of the lamp device. 39. The lighting device according to claim 23, wherein the inclined plane is made in the top face of the lamp device. 40. A lighting device according to claim 30, wherein the inclined plane is made in the top face of the lamp device. 41. The lighting device according to claim 16, wherein the lamp device has a circular cross-section. 42. The lighting device according to claim 23, wherein the lamp device has a circular cross-section. 43. The lighting device according to claim 30, wherein the lamp device has a circular cross-section. 44. A lighting device for installation in a substantially plane surface, comprising:at least one lamp device that emits light essentially in a light direction which forms an angle with an exit face of a light refracting means the lamp device, said lamp device comprising a light source that emits light towards an incident face of the light refracting means, wherein the light refracting means has a longitudinal direction coincident with the said light direction, and wherein the exit face is approximately parallel to the substantially plane surface, wherein the light refracting means is a prism grating consisting of discs of a glass material and light transmission preventing cover layers placed between the discs, wherein the prism grating comprises side faces running from the exit face to the incident face, at least one of the side faces forming an acute angle with the exit face, and at least the edge of the prism grating formed by at least the one side face that forms an acute angle between said side face and the exit face is rounded. 45. The lighting device according to claim 44, wherein the edges of the prism between the side faces are rounded, wherein two opposite side faces are curved. 46. The lighting device according to claim 44, wherein the discs have an average length between the incident face and the exit face from about 15 mm to about 30 mm, and a thickness between the cover layers from about 1 mm to about 2 mm. 47. The lighting device according to claim 45, wherein the discs have an average length between the incident face and the exit face from about 15 mm to about 30 mm, and a thickness between the cover layers from about 1 mm to about 2 mm. 48. The lighting device according to claim 44, wherein the discs have an average length between the incident face and the exit face of about 25 mm and a thickness between the cover layers of about 1.6 mm. 49. The lighting device according to claim 45, wherein the discs have an average length between the incident face and the exit face of about 25 mm and a thickness between the cover layers of about 1.6 mm. 50. The lighting device according to claim 23, wherein the cover layers are metal foil, and have a thickness from about 0.1 mm to about 0.2 mm. 51. The lighting device according to claim 30, wherein the cover layers are metal foil, and have a thickness from about 0.1 mm to about 0.2 mm. 52. The lighting device according to claim 39, wherein the cover layers are metal foil, and have a thickness from about 0.1 mm to about 0.2 mm. 53. The lighting device according to claim 23, wherein the cover layers are copper foil. 54. The lighting device according to claim 30, wherein the cover layers are copper foil. 55. The lighting device according to claim 39, wherein the cover layers are copper foil. 56. The lighting device according to claim 23, wherein the cover layers have a thickness of about 0.1 mm. 57. The lighting device according to claim 30, wherein the cover layers have a thickness of about 0.1 mm. 58. The lighting device according to claim 39, wherein the cover layers have a thickne ss of about 0.1 mm.