FIG. 14 is a planar cross-sectional view of a light fixture 1400, according to aspects of the disclosure. The fixture 1400 is similar to the fixture 800 of FIG. 8, and includes a concave light guide 1402. As illustrated, the concave light guide 1402 may lack a central opening with the centrally located illumination source 200, as shown in FIG. 8, and may instead have a recess 1404 formed thereon. The recess 1404 may have a triangular cross-section or another applicable cross-section as discussed in relation to FIG. 8. In some implementations, the recess 1404 may include a surface 1406 that defines the shape of cone. The vertex of the cone may be situated in the center of the light guide 1402 or at an off-center position. In some implementations, the light fixture 1400 may include a pan 1408 placed above the light guide 1402 such that it does not contain an internal opening, such as the internal opening 804 in FIG. 8.
