A luminaire module (100; 200) comprising: a plurality of light emitting elements (112; 212) operatively disposed on one or more substrates (110; 210); one or more optical couplers (120; 220) optically coupled with the plurality of light emitting elements and configured to direct light received from the plurality of light emitting elements at one or more input ends of the one or more optical couplers to one or more output ends of the one or more optical couplers, wherein a divergence of light at the one or more output ends of the one or more optical couplers is smaller than a divergence at the one or more input ends; a light guide (130; 230) optically coupled at an input end of the light guide with the one or more output ends of the one or more optical couplers, the light guide shaped to guide light received from the one or more optical couplers to an output end of the light guide in a forward direction, wherein one of the one or more optical couplers and the light guide is a hollow component; characterized by the luminaire module further comprising: an optical extractor (140; 240) optically coupled with the second end of the light guide at an input end of the optical extractor to receive light from the light guide, the optical extractor having a redirecting surface, the redirecting surface being spaced from the input end of the optical extractor and configured to reflect at least a portion of light received at the input end of the optical extractor in a backward direction into the ambient environment, wherein the luminaire module includes an anti-reflection layer (260; 265) between the one or more optical couplers and the light guide, and wherein the luminaire module is elongated perpendicular to the forward direction. a plurality of light emitting elements (112; 212) operatively disposed on one or more substrates (110; 210); one or more optical couplers (120; 220) optically coupled with the plurality of light emitting elements and configured to direct light received from the plurality of light emitting elements at one or more input ends of the one or more optical couplers to one or more output ends of the one or more optical couplers, wherein a divergence of light at the one or more output ends of the one or more optical couplers is smaller than a divergence at the one or more input ends; a light guide (130; 230) optically coupled at an input end of the light guide with the one or more output ends of the one or more optical couplers, the light guide shaped to guide light received from the one or more optical couplers to an output end of the light guide in a forward direction, wherein one of the one or more optical couplers and the light guide is a hollow component; characterized by the luminaire module further comprising: an optical extractor (140; 240) optically coupled with the second end of the light guide at an input end of the optical extractor to receive light from the light guide, the optical extractor having a redirecting surface, the redirecting surface being spaced from the input end of the optical extractor and configured to reflect at least a portion of light received at the input end of the optical extractor in a backward direction into the ambient environment, wherein the luminaire module includes an anti-reflection layer (260; 265) between the one or more optical couplers and the light guide, and wherein the luminaire module is elongated perpendicular to the forward direction. an optical extractor (140; 240) optically coupled with the second end of the light guide at an input end of the optical extractor to receive light from the light guide, the optical extractor having a redirecting surface, the redirecting surface being spaced from the input end of the optical extractor and configured to reflect at least a portion of light received at the input end of the optical extractor in a backward direction into the ambient environment, wherein the luminaire module includes an anti-reflection layer (260; 265) between the one or more optical couplers and the light guide, and wherein the luminaire module is elongated perpendicular to the forward direction.