A luminaire including a lamp, reflector, collimator and optional waveguide. The
waveguide can be solid or hollow or include several serially-arranged total internal
reflection (TIR) components for redirecting light that has entered the waveguide.
In one embodiment, the TIR components are prisms, but are provided without metallized
coatings thereby significantly reducing manufacturing costs. In another embodiment,
components are arranged in a vertical orientation such that light is directed downward
through a collimator or upward, either directly from the lamp or as a result of
reflection from the reflector.