Solid state illumination devices including spatially-extended light sources and reflectors

An apparatus, comprising:

• a light-emitting module having a cross-sectional shape;
• and
• a reflector having a reflective surface which, in cross-section, comprises a first portion and a second portion extending from opposing sides of the light-emitting module in a first direction and extending in a second direction orthogonal to the first direction, the reflective surface being positioned to receive light from the light-emitting module and configured so that the reflector and light-emitting module provide light having a light distribution which, in cross-section, extends from an angle α to −α about an axis parallel to the first direction,
• wherein, in cross-section, the first and second portions of the reflective surface each comprise a plurality of segments, each segment having a curvature based on a notional envelope circumscribing the cross-sectional shape of the light-emitting module, and the curvature of each segment is such that light from the light-emitting module incident on the reflective surface exits the apparatus after a single reflection from the reflective surface, and
• wherein the first and second portions each comprise a first segment closest to the light-emitting module, wherein, in cross-section, the first segments are shaped as respective involutes of the envelope.