Moisture-proof lamp, in particular a greenhouse lamp, comprising: - a lamp housing, - a plurality of light modules adapted for insertion into the lamp housing, - each light module comprising a light source with a plurality of LEDs, a connection cable leading to the light source, a heat sink arranged at a rear end of the light module for cooling the light source, and an optical element arranged at a front end of the light module for irradiating the light of the light source under a spatial beam angle, - the lamp housing comprising a top housing wall, a bottom housing wall and a circumferential housing side wall connecting these two housing walls (14, 16) and sealing the space between the two housing walls (14, 16) to the outside in a splash-proof manner, - a plurality of pairs of receiving openings (22, 24) for one respective light module being formed in the upper housing wall and the lower housing wall, said receiving openings being aligned with each other and each having an opening edge (28, 30), - a cylinder ring arranged, per pair of receiving openings (22, 24), between the upper housing wall and the lower housing wall and surrounding the two receiving openings (22, 24), said cylinder ring sealing the space between the upper housing wall and the lower housing wall of the lamp housing in a splash-proof manner, - each light module being adapted for insertion into a pair of receiving openings (22, 24), the front end of the light module resting on at least a section of the opening edge of the receiving opening of the bottom housing wall and its rear end is arranged protruding beyond the upper housing wall by the heat sink, - a power supply and control unit for the light modules, which is arranged outside the lamp housing, and - a plurality of electrical light module connectors arranged outside of the lamp housing and electrically connected to the power supply and control unit, each connector comprising, for each light module, a receptacle and a plug adapted to be detached from and connected to the receptacle for connecting the connection cable of each light module to the energy supply and control unit. - a lamp housing, - a plurality of light modules adapted for insertion into the lamp housing, - each light module comprising a light source with a plurality of LEDs, a connection cable leading to the light source, a heat sink arranged at a rear end of the light module for cooling the light source, and an optical element arranged at a front end of the light module for irradiating the light of the light source under a spatial beam angle, - the lamp housing comprising a top housing wall, a bottom housing wall and a circumferential housing side wall connecting these two housing walls (14, 16) and sealing the space between the two housing walls (14, 16) to the outside in a splash-proof manner, - a plurality of pairs of receiving openings (22, 24) for one respective light module being formed in the upper housing wall and the lower housing wall, said receiving openings being aligned with each other and each having an opening edge (28, 30), - a cylinder ring arranged, per pair of receiving openings (22, 24), between the upper housing wall and the lower housing wall and surrounding the two receiving openings (22, 24), said cylinder ring sealing the space between the upper housing wall and the lower housing wall of the lamp housing in a splash-proof manner, - each light module being adapted for insertion into a pair of receiving openings (22, 24), the front end of the light module resting on at least a section of the opening edge of the receiving opening of the bottom housing wall and its rear end is arranged protruding beyond the upper housing wall by the heat sink, - a power supply and control unit for the light modules, which is arranged outside the lamp housing, and - a plurality of electrical light module connectors arranged outside of the lamp housing and electrically connected to the power supply and control unit, each connector comprising, for each light module, a receptacle and a plug adapted to be detached from and connected to the receptacle for connecting the connection cable of each light module to the energy supply and control unit.