Abstract: EMI suppression in electrodeless discharge lamps by inward RF-reflectance from the enclosure walls (12) of 90%+ and use of an absorber (16) of RF power having an absorption coefficient greater than 40%, a transmission coefficient less than e.sup.-3, and an effective area facing the interior of the enclosure between 5% and 40% of the area of the RF-reflective light transmissive enclosure.

Abstract: A substantially flat, gas filled, arc discharge fluorescent lamp having an internal path in which the arc travels, where the path is formed by vertical sections between a substantially flat top and bottom surface. The path length can be controlled along with the height of the lamp to provide a wide range of lumens per unit volume while improving lamp life at low cost. A reflective coating, formed adjacent to the phosphor coating within the path, directs light to where wanted, while obviating the need for a separate reflector in the lamp fixture. One application of the present inventive lamp is to replace incandescent lamps by virtue of being mechanically interchangeable by virtue of having the flexibility for accommodating a small ballast within the lamp assembly.

Abstract: A narrow band light source is combined with a narrow band filter on the face of a traffic light to reduce the problem of sun glare reflected from one traffic light, reducing intensity of the sunlight glare while light from the narrow band source passes through the filter essentially unattenuated, allowing system efficiency to remain high.