Illumination devices including multiple light emitting elements

An illumination device comprising:

• a substrate having first and second opposing surfaces, such that each of the first and second surfaces are elongated and have a longitudinal dimension and a transverse dimension shorter than the longitudinal dimension;
• a plurality of light-emitting elements (LEEs) arranged on the first surface of the substrate and distributed along the longitudinal dimension, such that the LEEs emit, during operation, light in a first angular range with respect to a normal to the first surface of the substrate;
• one or more solid primary optics arranged in an elongated configuration along the longitudinal dimension of the first surface and coupled with the LEEs, the one or more solid primary optics being shaped to redirect light received from the LEEs in the first angular range, and to provide the redirected light in a second angular range, a divergence of the second angular range being smaller than a divergence of the first angular range at least in a plane perpendicular to the longitudinal dimension of the first surface of the substrate;
• a solid light guide comprising input and output ends, the input and output ends of the solid light guide being elongated in the longitudinal dimension and having substantially the same shape, wherein
• the input end of the solid light guide is coupled to the one or more solid primary optics to receive the light provided by the solid primary optic in the second angular range, and
• the solid light guide is shaped to guide the light received from the solid primary optic in the second angular range and to provide the guided light in substantially the same second angular range with respect to the first surface of the substrate at the output end of the solid light guide;
• and
• a solid secondary optic comprising an input end, a redirecting surface opposing the input end and first and second output surfaces, such that each of the input end, and redirecting, first output and second output surfaces of the solid secondary optic are elongated along the longitudinal dimension, wherein
• the input end of the solid secondary optic is coupled to the output end of the solid light guide to receive the light provided by the solid light guide in the second angular range,
• the redirecting surface has first and second portions that reflect the light received at the input end of the solid secondary optic in the second angular range, and provide the reflected light in third and fourth angular ranges with respect to the normal to the first surface of the substrate towards the first and second output surfaces, respectively, wherein at least prevalent directions of propagation of light in the third and fourth angular ranges are different from each other and from a prevalent direction of propagation of light in the second angular range at least perpendicular to the longitudinal dimension of the first surface of the substrate,
• the first output surface is shaped to refract the light provided by the first portion of the redirecting surface in the third angular range as first refracted light, and to output the first refracted light in a fifth angular range with respect to the normal to the first surface of the substrate outside the first output surface of the solid secondary optic, and
• the second output surface is shaped to refract the light provided by the second portion of the redirecting surface in the fourth angular range as second refracted light, and to output the second refracted light in a sixth angular range with respect to the normal of the first surface of the substrate outside the second output surface of the solid secondary optic.