Video projector
Multimedia projector is selected individually and, above all, by brightness, which corresponds to the light output of the video projector. Take into account lighting, light-reflectivity of walls and ceilings.
If it is impossible to buy a bright enough video projector, we choose the budget version and darken the hall for the duration of image demonstration. Once this practice was widespread, but today, in most cases, projectors capable of "overriding" the diffused light from the window are installed.