A lighting arrangement comprising: a mounting ring extending along a central longitudinal axis and having a plurality of tabs, a circular wall and a plurality of locking arms, each of said plurality of tabs defining a mounting aperture, said circular wall interconnecting said plurality of tabs, said circular wall having an inwardly-facing surface encircling said axis and defining a cavity, said circular wall also having an outwardly-facing surface opposite said inwardly-facing surface with a thickness defined between said inwardly-facing surface and said outwardly-facing surface, said circular wall extending a height along said axis between a downwardly-facing surface and an upwardly-facing surface, each of said plurality of locking arms projecting from said circular wall radially relative to said axis, each of said plurality of locking arms including a vertical portion extending along said axis and a circumferential portion extending about said axis, each of said circumferential portions extending from a first end at an intersection with one of said vertical portions to a respective second end distal relative to said first end, and each of said circumferential portions having an upper face and a lower face; a luminaire having a housing assembly and a light emitter and a plurality of posts, said housing assembly at least partially enclosing said light emitter, said housing assembly at least partially received in said cavity, each of said plurality of posts extending away from said housing assembly; and wherein said mounting ring and said luminaire are interconnectable by moving each of said plurality posts past each of said plurality of distal ends along said axis and rotating said mounting ring and said luminaire relative to one another in a first angular direction about said axis; characterized in that: at least one of said upper faces is defined by a plurality of planar surfaces (92c, 192c, 292c) delineated by a plurality of protuberances each with distinct edges, thereby enabling rotational progress of the luminaire to be audibly advised during interconnection by at least one of said posts sliding sequentially over a first of said plurality of surfaces (92c, 192c, 292c, 392c), over both distinct edges of a protuberance, and then over a second of said plurality of surfaces (92c, 192c, 292c, 392c). a mounting ring extending along a central longitudinal axis and having a plurality of tabs, a circular wall and a plurality of locking arms, each of said plurality of tabs defining a mounting aperture, said circular wall interconnecting said plurality of tabs, said circular wall having an inwardly-facing surface encircling said axis and defining a cavity, said circular wall also having an outwardly-facing surface opposite said inwardly-facing surface with a thickness defined between said inwardly-facing surface and said outwardly-facing surface, said circular wall extending a height along said axis between a downwardly-facing surface and an upwardly-facing surface, each of said plurality of locking arms projecting from said circular wall radially relative to said axis, each of said plurality of locking arms including a vertical portion extending along said axis and a circumferential portion extending about said axis, each of said circumferential portions extending from a first end at an intersection with one of said vertical portions to a respective second end distal relative to said first end, and each of said circumferential portions having an upper face and a lower face; a luminaire having a housing assembly and a light emitter and a plurality of posts, said housing assembly at least partially enclosing said light emitter, said housing assembly at least partially received in said cavity, each of said plurality of posts extending away from said housing assembly; and wherein said mounting ring and said luminaire are interconnectable by moving each of said plurality posts past each of said plurality of distal ends along said axis and rotating said mounting ring and said luminaire relative to one another in a first angular direction about said axis; characterized in that: at least one of said upper faces is defined by a plurality of planar surfaces (92c, 192c, 292c) delineated by a plurality of protuberances each with distinct edges, thereby enabling rotational progress of the luminaire to be audibly advised during interconnection by at least one of said posts sliding sequentially over a first of said plurality of surfaces (92c, 192c, 292c, 392c), over both distinct edges of a protuberance, and then over a second of said plurality of surfaces (92c, 192c, 292c, 392c). at least one of said upper faces is defined by a plurality of planar surfaces (92c, 192c, 292c) delineated by a plurality of protuberances each with distinct edges, thereby enabling rotational progress of the luminaire to be audibly advised during interconnection by at least one of said posts sliding sequentially over a first of said plurality of surfaces (92c, 192c, 292c, 392c), over both distinct edges of a protuberance, and then over a second of said plurality of surfaces (92c, 192c, 292c, 392c).