Abstract: An ignition transformer for gas discharge bulbs, or tubes, including a core, a primary coil, and a secondary coil. The transformer windings are wound axially along a rod-shaped core (1). The secondary winding includes two or more mutually concentric and axially extending windings (5, 6, 7), where each winding includes only one single layer. The primary winding (11) includes an axially extending winding that lies concentrically outside the outermost secondary winding (7).

Abstract: A method for controlling the full-beam headlights of automotive vehicles, particularly cars, which headlights are provided with dischargeable light sources. The light source (2) is chosen so that when supplying the light source with its nominal power it will produce a luminous flux which greatly exceeds the luminous flux that is standard for full-beam lighting, supplying the light source (2) with a lower power causes the light source (2) to produce a luminous flux which is normal for full-beam lighting. A power level selection (7; 10, 4) is provided for enabling the light source (2) to be supplied selectively with the lower power or with its nominal power.

Abstract: A method for compensating color when illuminating fluorescent objects by means of one or more illuminating lamps which emit a significant amount of ultraviolet light, particularly when illuminating flags hoisted on flag poles, wherein the objects include ultralight fluorescent material and have a white or a light color when illuminated with visible light. The object is provided with an additional fluorescent material which when illuminated fluoresces in a color that together with a weak blue color provides a white or essentially white color by additive color mixture, the blue color being derived by illumination of the object with ultraviolet light.

Abstract: A method of illuminating flags raised on flagpoles, particularly advertising flags of the kind placed along roads and highways adjacent restaurants, hotels, and gasoline stations. One or more flags containing ultralight fluorescent material are illuminated by one or more lamps which transmit a significant proportion of ultraviolet light.

Abstract: A method pertaining to vehicle headlamps which emit ultraviolet light and which include a light source for generating both ultra-violet light and visible light, and a filter which is placed in the beam path between the light source and the surroundings and which is intended to substantially filter out visible light and to transmit ultraviolet light, said headlamp, however, unintentionally transmitting a given proportion of visible light, such as red and blue light, of low intensity.

Abstract: A verge post having a plurality of flat vertical side faces and side edges for marking road verges or the boundaries of traffic lanes. The post is constructed with material which will fluoresce when illuminated with ultraviolet light, and to transmit visible light from the side faces and edges in two or more directions when illuminated with ultraviolet light from one direction. Different parts of the post can be made so they will fluoresce with different colors when illuminated with ultraviolet light.

Abstract: A fluorescing coating which fluoresces when illuminated with light within the ultraviolet wavelength range. The coating is intended primarily for road markings of different kinds and includes material (4;5) with pigment for emitting color when illuminated with light within the visible wavelength range and material which fluoresces when illuminated with light within the ultraviolet wavelength range. The coating further includes a binder (3). The invention is characterized in that the material which fluoresces when illuminated with light within the ultraviolet wavelength range consists of glass spheres (2) or glass pieces produced from a glass mass which has been doped with a dope additive such as to cause the glass in the glass spheres or glass pieces to fluoresce when illuminated with ultraviolet light.

Abstract: An arrangement in vehicle headlamps which are intended to emit a significant proportion of ultraviolet light. The invention is characterized by a control circuit (1) for adjusting, via means (3; 5, 9, 10), the intensity of the ulraviolet light emitted by the headlamp (6); vehicle speed sensing means (2) intended to deliver to the control circuit (1) an electric signal corresponding to prevailing vehicle speed; and further characterized in that the control circuit (1) is constructed to decrease said intensity to a predetermined, lower level when the speed lies beneath a predetermined value, and to increase the intensity to a predetermined, higher level when the speed lies above a predetermined value.