Luminaire for installation in a ceiling, in particular for installation in a suspended ceiling, comprising - a housing with an inlet duct for cooling a lamp accommodated in the housing by means of air flowing in the inlet duct in the direction of a main flow direction due to free convection, wherein the inlet duct has ∘ a first air inlet opening for admitting the flowing air into the inlet duct and ∘ a first air outlet opening (8, 81) for discharging the air flowing in the inlet duct from the inlet duct, and ∘ at least one exhaust air duct with ∘ a second air inlet opening for admitting the air flowing from the first air outlet opening (8, 81) into the exhaust air duct and ∘ a second air outlet opening for discharging the air flowing in the exhaust air duct from the exhaust air duct, wherein the second air outlet opening is offset relative to the first air inlet opening in the direction of the main flow direction, wherein the exhaust air duct has an element provided laterally with respect to the housing, wherein the element delimits a part of the exhaust air duct and a part of the second air outlet opening, and characterized in that the element has a through opening which forms the second air inlet opening. - a housing with an inlet duct for cooling a lamp accommodated in the housing by means of air flowing in the inlet duct in the direction of a main flow direction due to free convection, wherein the inlet duct has ∘ a first air inlet opening for admitting the flowing air into the inlet duct and ∘ a first air outlet opening (8, 81) for discharging the air flowing in the inlet duct from the inlet duct, and ∘ at least one exhaust air duct with ∘ a second air inlet opening for admitting the air flowing from the first air outlet opening (8, 81) into the exhaust air duct and ∘ a second air outlet opening for discharging the air flowing in the exhaust air duct from the exhaust air duct, wherein the second air outlet opening is offset relative to the first air inlet opening in the direction of the main flow direction, wherein the exhaust air duct has an element provided laterally with respect to the housing, wherein the element delimits a part of the exhaust air duct and a part of the second air outlet opening, and characterized in that the element has a through opening which forms the second air inlet opening. ∘ a first air inlet opening for admitting the flowing air into the inlet duct and ∘ a first air outlet opening (8, 81) for discharging the air flowing in the inlet duct from the inlet duct, and ∘ at least one exhaust air duct with ∘ a second air inlet opening for admitting the air flowing from the first air outlet opening (8, 81) into the exhaust air duct and ∘ a second air outlet opening for discharging the air flowing in the exhaust air duct from the exhaust air duct, wherein the second air outlet opening is offset relative to the first air inlet opening in the direction of the main flow direction, wherein the exhaust air duct has an element provided laterally with respect to the housing, wherein the element delimits a part of the exhaust air duct and a part of the second air outlet opening, and characterized in that the element has a through opening which forms the second air inlet opening. wherein the second air outlet opening is offset relative to the first air inlet opening in the direction of the main flow direction, wherein the exhaust air duct has an element provided laterally with respect to the housing, wherein the element delimits a part of the exhaust air duct and a part of the second air outlet opening, and characterized in that the element has a through opening which forms the second air inlet opening.