Modular luminaire support

A light fitting for recessed mounting of a luminaire in a substrate, the light fitting comprising a luminaire support, which luminaire support has a neck portion to support and configured to be removably attached to a luminaire or parts thereof and a head portion having a light beam channel for the passage of light from a luminaire through the luminaire support to a mouth, the light beam channel defined by an internal surface of the head portion, wherein the luminaire support comprises a luminaire support body and a peripheral insert removably mountable within the luminaire support body, wherein the peripheral insert defines at least a portion of the light beam channel, wherein the light fitting further comprises a lens and an optical mount for the lens, the optical mount disposed in a throat portion of the luminaire support, wherein the optical mount comprises a seat for supporting the lens and a corresponding recess for receiving the lens, wherein the lens is removably mountable in the optical mount, and wherein the peripheral insert serves to retain the lens in position in the optical mount, whereby the lens may be removed via the mouth of the luminaire support by first removing the peripheral insert from the luminaire support body, wherein the peripheral insert defines a recess or aperture for receipt of a laterally extending or extendable protrusion.