Organic light emitting devices are disclosed which are comprised of a heterostructure for producing electroluminescence wherein the heterostructure is comprised of an emissive layer containing a phosphorescent dopant compound. The strip includes an elongate plastic strip having a flat base portion and a plurality of laterally spaced apart lengthwise extending rib portions upstanding from the base portion; and a plurality of elongate reinforcing members extending lengthwise within respective rib portions, the rib portions and the reinforcing members forming composite ribs. A movable image detector is optically coupled to the other image plane to sample the received light at different locations thereof to generate another set of image data at a higher resolution than the image data obtained by the fixed detector. The maintenance means include first lamp base receivers and second lamp base receivers formed in the second planar surface ; and first and second lamp base retainers, respectively, associated with the second planar surface. The upper part includes front, rear, right, left and upper side parts, of which at least the upper side part consists of a glass pane and wherein the upper part can be moved by an electric motor.