An illumination device (300; 500) comprising: one or more white light emitting diodes, LEDs ; and a solid optic having a cross-sectional profile comprising: an input interface (142; 242) arranged to receive white light emitted by the one or more white LEDs; a convex output surface (144; 244; 344) opposite the input interface; a concave first side surface (146; 246; 346) extending between the input interface and the convex output surface; and a second side surface (148; 248; 348) opposite the concave first side surface extending from the input interface to the convex output surface, wherein the concave first side surface and the convex output surface are shaped and arranged such that, when the solid optic receives input light at the input interface having an input angular range in a plane of the cross-sectional profile, the solid optic guides the light to and emits the light from the output surface in an output angular range in the plane, where a prevalent propagation direction of output light in the output angular range is tilted toward the second side surface relative to a prevalent propagation direction of input light in the input angular range, and the solid optic has an elongate extension extending from the plane of the cross-sectional profile. one or more white light emitting diodes, LEDs ; and a solid optic having a cross-sectional profile comprising: an input interface (142; 242) arranged to receive white light emitted by the one or more white LEDs; a convex output surface (144; 244; 344) opposite the input interface; a concave first side surface (146; 246; 346) extending between the input interface and the convex output surface; and a second side surface (148; 248; 348) opposite the concave first side surface extending from the input interface to the convex output surface, wherein the concave first side surface and the convex output surface are shaped and arranged such that, when the solid optic receives input light at the input interface having an input angular range in a plane of the cross-sectional profile, the solid optic guides the light to and emits the light from the output surface in an output angular range in the plane, where a prevalent propagation direction of output light in the output angular range is tilted toward the second side surface relative to a prevalent propagation direction of input light in the input angular range, and the solid optic has an elongate extension extending from the plane of the cross-sectional profile. an input interface (142; 242) arranged to receive white light emitted by the one or more white LEDs; a convex output surface (144; 244; 344) opposite the input interface; a concave first side surface (146; 246; 346) extending between the input interface and the convex output surface; and a second side surface (148; 248; 348) opposite the concave first side surface extending from the input interface to the convex output surface, wherein the concave first side surface and the convex output surface are shaped and arranged such that, when the solid optic receives input light at the input interface having an input angular range in a plane of the cross-sectional profile, the solid optic guides the light to and emits the light from the output surface in an output angular range in the plane, where a prevalent propagation direction of output light in the output angular range is tilted toward the second side surface relative to a prevalent propagation direction of input light in the input angular range, and the solid optic has an elongate extension extending from the plane of the cross-sectional profile. <EOS>