A lighting device comprising: a plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128) arranged in a ring-shaped geometry having a first central axis of symmetry; an optical element comprising a ring-shaped collimating structure configured to collimate light emitted by the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128), the ring-shaped collimating structure having a second central axis of symmetry, wherein the optical element is arranged in relation to the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128) such that the first and second central axis of symmetry coincides; and light-mixing optics configured to mix light emitted by the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128), wherein the light-mixing optics comprises a microlens array comprising a plurality of lenslets arranged at least on the exit surface opposite to the ring-shaped collimating structure, wherein the optical element is arranged such that a focus of a segment of the optical element, thereby forming a ring-shape focus, is in the radial direction on a nearest portion of the plurality of solid-state lighting elements (112, 114, 116, 122, 124, 126, 128) arranged in a ring-shaped geometry, characterized in that the lenslets are elliptical and each has a smaller radius of curvature along the tangential direction of the ring-shaped collimating structure than in the radial direction of the ring-shaped collimating structure, or in that the lenslets are circular and are arranged with a closer spacing in the radial direction of the ring-shaped collimating structure than in the tangential direction of the ring-shaped collimating structure, said light-mixing optics being configured to apply a different degree of light-mixing in a tangential direction of the ring-shaped collimating structure than in a radial direction of the ring-shaped collimating structure. a plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128) arranged in a ring-shaped geometry having a first central axis of symmetry; an optical element comprising a ring-shaped collimating structure configured to collimate light emitted by the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128), the ring-shaped collimating structure having a second central axis of symmetry, wherein the optical element is arranged in relation to the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128) such that the first and second central axis of symmetry coincides; and light-mixing optics configured to mix light emitted by the plurality of solid state lighting elements (112, 114, 116, 118, 122, 124, 126, 128), wherein the light-mixing optics comprises a microlens array comprising a plurality of lenslets arranged at least on the exit surface opposite to the ring-shaped collimating structure, wherein the optical element is arranged such that a focus of a segment of the optical element, thereby forming a ring-shape focus, is in the radial direction on a nearest portion of the plurality of solid-state lighting elements (112, 114, 116, 122, 124, 126, 128) arranged in a ring-shaped geometry, characterized in that the lenslets are elliptical and each has a smaller radius of curvature along the tangential direction of the ring-shaped collimating structure than in the radial direction of the ring-shaped collimating structure, or in that the lenslets are circular and are arranged with a closer spacing in the radial direction of the ring-shaped collimating structure than in the tangential direction of the ring-shaped collimating structure, said light-mixing optics being configured to apply a different degree of light-mixing in a tangential direction of the ring-shaped collimating structure than in a radial direction of the ring-shaped collimating structure.