A luminaire module comprising: one or more light-emitting elements (LEEs) (210; 310; 410) arranged to provide light; a light guide (230; 330; 430) comprising a receiving end and an opposing end , the receiving end arranged to receive the light provided by the LEEs (210; 310; 410), a pair of opposing side surfaces (332a, 332b; 432a, 432b) extending along a length of the light guide (230; 330; 430) between the receiving end and the opposing end , the light guide (230; 330; 430) configured to guide the received light in a forward direction, along the length of the light guide (230; 330; 430) toward the opposing end of the light guide, and transmit a first portion of the guided light (355'; 355"; 455) into ambient environment through one or more of the opposing side surfaces (332a, 332b; 432a, 432b) as sideways leaked light; and an optical extractor (240; 340; 440) located at the opposing end and configured to output into the ambient environment a remaining portion of the guided light (345'; 345"; 445) that reaches the opposing end as output light in backward directions, wherein the luminaire module is elongated perpendicular to the forward direction; wherein the optical extractor (240; 340; 440) comprises at least one redirecting surface (242; 244), the at least one redirecting surface (242; 244) of the optical extractor (240; 340; 440) being adapted to reflect at least a portion of the guided light in a direction that has a component orthogonal to the forward direction, and wherein the light guide is tapered such that a receiving aperture at the receiving end of the light guide is larger than an output aperture at the opposing end, wherein a divergence of an angular range of guided light exceeds a critical value beyond a predetermined distance from the receiving end so that some of the light guided beyond the predetermined distance transmits into the ambient environment through the opposing side surfaces as the sideways leaked light (355'; 355"). one or more light-emitting elements (LEEs) (210; 310; 410) arranged to provide light; a light guide (230; 330; 430) comprising a receiving end and an opposing end , the receiving end arranged to receive the light provided by the LEEs (210; 310; 410), a pair of opposing side surfaces (332a, 332b; 432a, 432b) extending along a length of the light guide (230; 330; 430) between the receiving end and the opposing end , the light guide (230; 330; 430) configured to guide the received light in a forward direction, along the length of the light guide (230; 330; 430) toward the opposing end of the light guide, and transmit a first portion of the guided light (355'; 355"; 455) into ambient environment through one or more of the opposing side surfaces (332a, 332b; 432a, 432b) as sideways leaked light; and an optical extractor (240; 340; 440) located at the opposing end and configured to output into the ambient environment a remaining portion of the guided light (345'; 345"; 445) that reaches the opposing end as output light in backward directions, wherein the luminaire module is elongated perpendicular to the forward direction; wherein the optical extractor (240; 340; 440) comprises at least one redirecting surface (242; 244), the at least one redirecting surface (242; 244) of the optical extractor (240; 340; 440) being adapted to reflect at least a portion of the guided light in a direction that has a component orthogonal to the forward direction, and wherein the light guide is tapered such that a receiving aperture at the receiving end of the light guide is larger than an output aperture at the opposing end, wherein a divergence of an angular range of guided light exceeds a critical value beyond a predetermined distance from the receiving end so that some of the light guided beyond the predetermined distance transmits into the ambient environment through the opposing side surfaces as the sideways leaked light (355'; 355"). <EOS>