Abstract: Systems and methods for constructing a modular waveguide light fixture are described herein. One aspect of the subject matter described in the disclosure is an apparatus for providing lighting. The apparatus can include a base including a body surrounding a cavity. The apparatus can include a light source disposed within the cavity and configured to emit light. The apparatus can include a waveguide extending from a proximal end to a distal end along a central axis and comprising a core surrounded by an outer surface along the central axis. The proximal end can be configured to interface with and receive the light from the light source. The waveguide can be configured to propagate light within the core via total internal reflection within the outer surface of the waveguide. The apparatus can include a diffusion zone disposed along a portion of the outer surface.