A greenhouse (1) comprising at least one gutter section (4) and a roof extending from said gutter section, which roof comprises a ridge section (6) and glazing bars which are connected to an edge of the gutter section (4) near one end and to the ridge section (6) near the other end, whilst panes (7) are provided between adjacent glazing bars, which panes are supported in rebates of the glazing bars/gutter section (4) and between two flanges of the ridge section (6), characterised in that an outside wall side (10) of the greenhouse is at least partially provided with air permeable light-blocking means (11) so as to block emission of light from the greenhouse (1) into the atmosphere, said light-blocking means (11) comprising louvers (14) extending parallel to each other,wherein the louvers (14) are profiled, and wherein the profiles of adjacent louvers (14) overlap in transverse direction.
