Described is a light screen with curved outside reflectors and perpendicular cross lamellas with roughly V-shaped cross-section, each of which is inserted into the outside reflectors through corresponding cut-outs, whereby the walls of the cross lamella feature bracket edges on the top which are arranged on the inside of the outer reflectors. In order to attach the cross lamella to an outside reflector by machine in a simple manner, a straight lip on the bottom of the cross lamella is designed as a bracket edge and can be driven into the outside reflector, ana the walls of the cross lamella feature outward breaks which penetrate the cut-out in the outside reflector and when locked rest against the outside of the outside reflector.