Abstract: The invention relates to a lighting device for installation in a substantially plane surface, for example, the surface of a runway. The lighting device comprises at least one lamp unit that emits light essentially in a light direction which forms an angle ? with an axis at right angles to the substantially plane surface. Furthermore, the lighting device comprises at least one light refracting means having a longitudinal direction coincident with the light direction, an incident face substantially at right angles to the light direction, and an exit face parallel to the substantially plane surface. The light refracting means is preferably a prism grating. The lighting means is characterised in that the light refracting means is supported by a supporting means that extends along the whole of or a substantial part of the length of the light refracting means, and which preferably envelops the side faces of the light refracting means.

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.