Abstract: The invention relates to a lighting device (1) comprising a plurality of light sources which are capable of emitting light towards a surface (S). The lighting device is arranged in such a way that light from at least one first light source (2) forms a first lighting pattern (I) of white light on said surface and light from a plurality of second light sources (3) forms a second lighting pattern (II) of light of a different color on said surface. The second lighting pattern substantially surrounds said first white lighting pattern.

Abstract: A circuit arrangement for operating at a supply voltage V.sub.n a high-pressure sodium discharge lamp (4) having a lamp voltage V.sub.la in conjunction with a current limiter circuit (3) and a first controlled semiconductor switching element (1). The circuit arrangement comprisesa first part of comparing a proportional part of the lamp voltage V.sub.la with a reference voltage V.sub.r anda second part for comparing a proportional part of the supply voltage V.sub.n with the resultant of the first comparison. The circuit arrangement makes it possible to operate the lamp so that the lamp voltage V.sub.la is substantially constant.