Narrow aperture luminaires and light guides therefor

A light guide comprising:

• an elongated base comprising a light emitting surface at a distal end, and opposing major faces;
• and
• a plurality of collimators projecting from the base, wherein each collimator comprises a light receiving surface at a proximal end,
• wherein the plurality of collimators are arranged with spaces therebetween along the base,
• wherein the light emitting surface comprises notches having a minimum width corresponding to the space between the collimators and a maximum width corresponding to a space between the light receiving surfaces,
• whereby substantially all light received at the light receiving surfaces internally reflects through the collimators and the base and emits from the light emitting surface,
• whereby the notches are configured to direct light emitted from the light emitting surface at a lower angle than if the notches were not present, and
• wherein each collimator comprises opposing sides, each opposing side comprising a protrusion, wherein an upper face of the protrusion defines a lateral portion of the light receiving surface, and wherein the protrusion tapers distally into a plane of the opposing side at a point along the opposing side at least half a width of a light source for the light guide above the bottom of the collimator.