A luminaire comprising: a heat sink formed by one integral piece of cold forged aluminum, said piece comprising: an essentially flat base portion, having a base surface with a center and an outer periphery, a set of heat dissipating fins (3, 4) extending from a first side of said base surface, in a direction normal to said base surface, said set including: at least one radial heat dissipating fin having a cross section in a plane parallel to said base surface which cross section extends substantially in a radial direction from said center towards said outer periphery, and at least one peripheral heat dissipating fin having a cross section in a plane parallel to said base surface which cross section includes a portion extending in a direction parallel to said outer periphery, wherein the peripheral heat dissipating fins are arranged radially outside the radial heat dissipating fins; a set of solid state light emitting devices supported by said base portion on a second side opposite said first side with the heat dissipating fins, said solid state light emitting devices being in thermal connection with said heat sink, and driver circuitry connected to drive the light emitting devices; characterized by said driver circuitry being arranged on one side of the center and on the same side of the base portion as the heat dissipating fins, wherein said radial heat dissipating fins are arranged so as to counter-balance a weight of said driver circuitry, such that said luminaire will be balanced around said center. a heat sink formed by one integral piece of cold forged aluminum, said piece comprising: an essentially flat base portion, having a base surface with a center and an outer periphery, a set of heat dissipating fins (3, 4) extending from a first side of said base surface, in a direction normal to said base surface, said set including: at least one radial heat dissipating fin having a cross section in a plane parallel to said base surface which cross section extends substantially in a radial direction from said center towards said outer periphery, and at least one peripheral heat dissipating fin having a cross section in a plane parallel to said base surface which cross section includes a portion extending in a direction parallel to said outer periphery, wherein the peripheral heat dissipating fins are arranged radially outside the radial heat dissipating fins; an essentially flat base portion, having a base surface with a center and an outer periphery, a set of heat dissipating fins (3, 4) extending from a first side of said base surface, in a direction normal to said base surface, said set including: at least one radial heat dissipating fin having a cross section in a plane parallel to said base surface which cross section extends substantially in a radial direction from said center towards said outer periphery, and at least one peripheral heat dissipating fin having a cross section in a plane parallel to said base surface which cross section includes a portion extending in a direction parallel to said outer periphery, wherein the peripheral heat dissipating fins are arranged radially outside the radial heat dissipating fins; at least one radial heat dissipating fin having a cross section in a plane parallel to said base surface which cross section extends substantially in a radial direction from said center towards said outer periphery, and at least one peripheral heat dissipating fin having a cross section in a plane parallel to said base surface which cross section includes a portion extending in a direction parallel to said outer periphery, wherein the peripheral heat dissipating fins are arranged radially outside the radial heat dissipating fins; a set of solid state light emitting devices supported by said base portion on a second side opposite said first side with the heat dissipating fins, said solid state light emitting devices being in thermal connection with said heat sink, and driver circuitry connected to drive the light emitting devices; characterized by said driver circuitry being arranged on one side of the center and on the same side of the base portion as the heat dissipating fins, wherein said radial heat dissipating fins are arranged so as to counter-balance a weight of said driver circuitry, such that said luminaire will be balanced around said center.