Patent ID: 7172328

Claim:
A lighting system provided with a light-emitting panel ( 1 ) comprising a front wall ( 2 ), a rear wall ( 3 ) situated opposite thereto, and furthermore, between the front and the rear wall ( 2 , 3 ), a translucent input edge surface ( 4 ) for coupling light into the light-emitting panel ( 1 ), while at least a light source ( 6 , 6 â€², . . . ) is associated with the input edge surface ( 4 ), and while, in operation, light originating from the light source ( 6 , 6 â€², . . . ) is incident on the input edge surface ( 4 ) and distributes itself in the light-emitting panel ( 1 ), characterized in that the rear wall ( 3 ) in a first portion ( 12 ) of the light-emitting panel ( 1 ) is provided with a multiplicity of steps ( 13 , 13 â€², . . . ), and in that a second portion ( 22 ) of the light-emitting panel ( 1 ) widens from the input edge surface ( 4 ) in a direction facing the first portion ( 12 ) characterized in that a surface ( 17 ) of the steps ( 13 , 13 â€², . . . ) facing the input edge surface ( 4 ) makes an average angle Î² av with respect to a normal ( 25 ) on a bisecting plane ( 20 ) bisecting the light-emitting panel ( 1 ), wherein the bisecting plane ( 20 ) comprises a bisecting line ( 21 ) in the input edge surface ( 4 ), said bisecting line ( 21 ) being parallel to the front wall ( 2 ) and bisecting the input edge surface ( 4 ), and wherein the average angle Î² av is in the range 5â‰¦Î² av â‰¦25Â°.