are arranged to face in a direction along a longitudinal axis of the light guiding plate not shown advantageously the brightness of the leds may not be directly visible and the creation of a lighting system having a small thickness is facilitated in this manner the light from the leds is guided within the light guiding plate in other aspects this preferred alternative example of the lighting system according to the present invention is similar to the lighting systems according to fig3 to 5 in fact the leds may be oriented in any direction as required by any specific application for example some leds may face in one direction along the normal while other leds may face the opposite direction moreover with reference to fig3 the light guiding plate 2 is curved about an axis running parallel to a longitudinal axis direction l of the light guiding plate the lighting system is suspended by means of fastening means 4 such as bolts wires brackets etc with respect to an underside of the lighting system the curvature is concave and has a curvature r it is preferred that following expression holds for the curvature r where d is the thickness of the light guiding plate 2 and n is the refractive index of the light guiding plate 2 a curvature r satisfying the expression above may be such that it hardly or not at all affects the light guiding operation i e glare requirement and other general lighting conditions may still be fulfilled advantageously the lighting system according to fig3 may cause some collimation of the.