Abstract: A luminaire head (12) for a luminaire (1), preferably an outdoor luminaire, said luminaire head (12) comprising: a light module (121) provided with a light source (1211); a gear module (122) provided with a light source driving means; and a fixation assembly (10) configured to connect the luminaire head (12) to a luminaire support, such as a luminaire pole (11), and to adjust an orientation of at least the light module (121); wherein a first portion of the luminaire head (12) comprising at least the fixation assembly (10) extends over a distance of at least 25% of a length (LI) of the luminaire head (12), and a second portion of the luminaire head (12) comprising at least the light module (121) is configured to be rotated with respect to said first portion around a rotation axis (A); wherein the fixation assembly (10) is configured to fix the light module (121) in a plurality of fixing positions (P1, P2, P3).

Abstract: A high intensity discharge lamp comprises a discharge vessel and two electrode rods having substantially flat ends facing to each other in opposite positions within the discharge vessel. A spiral coil of wire is wound at least on a part of the surface of at least one of the electrode rods. The spiral coil protrudes over said end of the corresponding electrode rod and thus forms a hollow cavity for extending dimmable wattage range of the lamp.

Abstract: A high intensity discharge lamp comprising a discharge vessel having a wall enclosing a discharge space, an ionizable material contained in said space, and at least two electrodes each having an embedded portion and an electrode shaft extending from the wall of the discharge vessel and ending with a tip of the electrode, the electrodes being arranged in said space for establishment of an electric arc between said tips. Each of the electrode shafts of the electrodes comprises a thickened portion arranged between the embedded portion and the tip of the electrode, a first shaft section extending between the embedded portion and the thickened portion, the first shaft section having a first length and a first shaft diameter, and a second shaft section extending between the thickened portion and the tip of the electrode, the second shaft section having a second length and a second shaft diameter.

Abstract: A high intensity discharge lamp comprises an arc tube, which encloses an arc chamber. The arc chamber contains a gas fill and the arc tube is terminated by at least one sealed portion. The sealed portions enclose an electrode assembly. The electrode assembly comprises an electrode, a lead-in wire and an electrically conducting foil. The electrode extends into the arc chamber. The lead-in wire extends outward from the sealed portion for providing electric contact with a power supply. The electrically conducting foil connects the lead-in wire and the electrode and provides a sealed electric connection through a sealed portion of the arc tube. At least one of the electrodes is provided with surface irregularities in a region between the foil and the arc chamber in order to control shape and size of cracks in a seal wall surrounding the electrodes. In the method, an electrode of predetermined geometry and structure is provided with at least one artificial surface irregularity.