Abstract: 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.

Abstract: 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.