a light source including a plurality of light emitters;

a heat-dissipating member thermally connected to the light source;

a drive including a drive circuit for the light source;

a housing that is configured to accommodate the light source, the heat-dissipating member, and the drive, the housing including a plurality of vents and a light-emission opening to allow light from the light source to pass through the light-emission opening, the housing being rectangular and including a first surface having a first side with a first dimension and a second side with a second dimension greater than the first dimension, a second surface having the second side and a third side with a third dimension greater than the second dimension, and a third surface having the first side and the third side, the light-emission opening being in the first surface, a first vent and a second vent of the plurality of vents being in the second surface, the first vent being nearer the light-emission opening than the second vent, the second vent being located opposite to the light-emission opening, the light source being adjacent to the light-emission opening, the heat-dissipating member facing the first vent, the drive being between the first vent and the second vent;

an axial fan at the second vent, the axial fan being configured to blow air from inside the housing to outside the housing, the axial fan having a fan size greater than the first dimension and less than the second dimension;

a first plate at the second vent, the first plate facing the axial fan with a spacing less than or equal to the first dimension between the first plate and the axial fan; and

a second plate outside the housing, the second plate separating the first vent and the second vent.