An illumination device comprising: a plurality of light-emitting elements LEEs; a light guide extending in a forward direction from a first end of the light guide to a second end of the light guide, the light guide being positioned to receive at the first end light emitted by the LEEs and configured to guide the received light to the second end via total internal reflection TIR; and an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor being formed from a transparent, solid material and comprising: a first output surface including a transmissive portion arranged and shaped to transmit a first portion of the guided light to the ambient environment in a forward angular range and a reflective portion arranged and shaped to reflect via TIR all the guided light incident on the reflective portion, and a second output surface (246, 248) having a curvilinear profile in a cross-section that includes the forward direction, the second output surface arranged to transmit, to the ambient environment in a backward angular range, light reflected by the reflective portion of the first output surface, wherein the reflective portion of the first output surface has a first end and a second end and is arranged to intersect the transmissive portion of the first output surface at the first end and the second output surface at the second end, or wherein the transmissive portion of the first output surface has a first end and a second end and is arranged to intersect the reflective portion of the first output surface at the first end and the second output surface at the second end [former claim 6, original claim 7]. a plurality of light-emitting elements LEEs; a light guide extending in a forward direction from a first end of the light guide to a second end of the light guide, the light guide being positioned to receive at the first end light emitted by the LEEs and configured to guide the received light to the second end via total internal reflection TIR; and an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor being formed from a transparent, solid material and comprising: a first output surface including a transmissive portion arranged and shaped to transmit a first portion of the guided light to the ambient environment in a forward angular range and a reflective portion arranged and shaped to reflect via TIR all the guided light incident on the reflective portion, and a second output surface (246, 248) having a curvilinear profile in a cross-section that includes the forward direction, the second output surface arranged to transmit, to the ambient environment in a backward angular range, light reflected by the reflective portion of the first output surface, wherein the reflective portion of the first output surface has a first end and a second end and is arranged to intersect the transmissive portion of the first output surface at the first end and the second output surface at the second end, or wherein the transmissive portion of the first output surface has a first end and a second end and is arranged to intersect the reflective portion of the first output surface at the first end and the second output surface at the second end [former claim 6, original claim 7]. a first output surface including a transmissive portion arranged and shaped to transmit a first portion of the guided light to the ambient environment in a forward angular range and a reflective portion arranged and shaped to reflect via TIR all the guided light incident on the reflective portion, and a second output surface (246, 248) having a curvilinear profile in a cross-section that includes the forward direction, the second output surface arranged to transmit, to the ambient environment in a backward angular range, light reflected by the reflective portion of the first output surface, wherein the reflective portion of the first output surface has a first end and a second end and is arranged to intersect the transmissive portion of the first output surface at the first end and the second output surface at the second end, or wherein the transmissive portion of the first output surface has a first end and a second end and is arranged to intersect the reflective portion of the first output surface at the first end and the second output surface at the second end [former claim 6, original claim 7].