A bar hanger member is provided. The bar hanger member is for assembling with another like-member by superposition thereon to form a bar hanger for supporting recessed luminaires. The bar hanger member includes: an elongated body having a front face and a rear face; a channel extending through the body along the lengthwise axis; and first and second protrusions extending from the body aligned with the channel. The first and second protrusions are sized and shaped for slidable engagement with the channel of the like-member. When the bar hanger is assembled with the like-member, the second protrusion of the bar hanger engages in the channel of the like-member and the first protrusion of the like-member engages in the channel of the bar hanger member.