Abstract: A screening device (3) for screening exterior light (2) which illuminates a room (1), is controlled such that in the room on the one hand, user comfort with regard to freedom from dazzling and room temperature is optimal and, on the other hand, energy consumption for artificial lighting within the room or for heating and cooling the room is minimized.

Abstract: In a system for the control of several appliances (1-5), in particular light fittings distributed in several rooms (A, B, C), from a central command generator (10, 11), and with a method for setting this system into operation, one of the appliances (5) is selected and monitored for the issue of an externally detectable identification signal. All appliances (1-5) already have, before installation of the system, an original address (U4, U2, U1, U5, U3) and are installed without regard to these original addresses. After the installation, the original addresses (U4, U2, U1, U5, U3) are chosen one after the other, and the associated appliances (1-5) instructed to identify themselves. When the selected appliance (5) identifies itself, there is transmitted thereto a preset operational address (B5). This method is then repeated with other selected appliances (1-5), until all appliances have operational addresses (B1-B5).

Abstract: A lamp with at least one oblong means of lighting is mounted in a reflector cage which is attached beneath curved reflector surfaces. In order to attach the lamp directly to a ceiling, the reflector surfaces are given a roughly V-shaped front-view profile and their outer longitudinal leading edges extend to proximity with ceiling elements to which the lamp is fastened.

Abstract: A lamp cover in particular for fluorescent lamps consists of a light-transmitting material which at least on one surface features a structure which affects the rays of light that penetrate the material. The present lamp cover is to achieve a soft-focus effect, i.e. light-impervious elements located in the ray path should not be recognizable from the outside. In addition, the lamp cover should have a light-directing effect whereby in the polar diagram in terms of inensity the direction of the light beam hitting the structure in essence has the same direction as the light beam exiting the structure whereby the exiting light beam features a ray expansion.