A luminaire for indirect lighting has a main reflector, a counter-reflector with a light emission window in a plane T. The structured update requests may be defined in a business object-specific structured query language. The bond strength between the cured paint coating and the ball surface is enhanced so that the paint coating has abrasion durability. The apparatus is ergonomically designed to enable it to be easily worn and to enable a user to operate a computer from a standing, sitting or reclining position.