Techniques and architecture are disclosed for horticultural lighting systems and devices, such as a light module assembly. The assembly includes a housing with a first and second light module attached thereto. The first and second light modules include a mounting block to be received in the housing. The mounting block includes a plurality of light sources to generate light to stimulate growth of a plant. The first light module includes a first removable lens to focus light from the light sources to a first portion of the plant and in a first direction relative to the plant. The second light module includes an optical conduit attached thereto. The conduit is to focus light from the light sources to a second portion of the plant and in a second direction different from the first direction. The assembly transmits light to an upper portion and a lower portion of the plant.