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 configured to support and to be removably attached to a luminaire or parts thereof, an expanded waist portion, 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, wherein the peripheral insert defines at least a portion of the light beam channel; an optical element and an optical mount for the optical element, the optical mount disposed in a throat portion of the luminaire support, wherein the optical element is removably mountable in the optical mount via the mouth; and a base having an outer aperture for removably receiving the luminaire support via the outer aperture and a socket portion arranged to receive the waist portion, wherein at least one of the socket portion or the waist portion has a resilient member arranged to releasably retain the waist portion in the socket portion, and wherein angular orientation of the luminaire support in relation to the base is adjustable by way of relative movement between the socket portion and the waist portion, wherein the peripheral insert, when mounted in the luminaire support body, defines an optical element receiving recess together with a seat of the optical mount in which the optical element may be disposed, extending into the optical element receiving recess and held securely against the seat by an inner rim of the peripheral insert, and wherein the peripheral insert defines a recess or aperture for receipt of a laterally extending or extendable protrusion disposed in the light beam channel, and wherein said recess or aperture for receipt of a laterally extending or extendable protrusion is formed in the internal surface and is separate from the optical mount. a luminaire support, which luminaire support has: a neck portion configured to support and to be removably attached to a luminaire or parts thereof, an expanded waist portion, 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, wherein the peripheral insert defines at least a portion of the light beam channel; an optical element and an optical mount for the optical element, the optical mount disposed in a throat portion of the luminaire support, wherein the optical element is removably mountable in the optical mount via the mouth; and a base having an outer aperture for removably receiving the luminaire support via the outer aperture and a socket portion arranged to receive the waist portion, wherein at least one of the socket portion or the waist portion has a resilient member arranged to releasably retain the waist portion in the socket portion, and wherein angular orientation of the luminaire support in relation to the base is adjustable by way of relative movement between the socket portion and the waist portion, wherein the peripheral insert, when mounted in the luminaire support body, defines an optical element receiving recess together with a seat of the optical mount in which the optical element may be disposed, extending into the optical element receiving recess and held securely against the seat by an inner rim of the peripheral insert, and wherein the peripheral insert defines a recess or aperture for receipt of a laterally extending or extendable protrusion disposed in the light beam channel, and wherein said recess or aperture for receipt of a laterally extending or extendable protrusion is formed in the internal surface and is separate from the optical mount.