Reflected ceiling plans in larger projects such as offices, restaurants, schools, and retail outlets. placement is determined by calculation using formulas that yield the desired light levels. Along with the satisfactory selection of quality light fittings. Lighting is usually planned on overlay sheets placed over floor plans. A reflected ceiling plan is the usual final drawing in which most lighting is indicated in a commercial project. Although portable lamps such as movable lighting devices that are plugged into outlets or have mounting heights and much lower than a ceiling hot can be moved around to other areas or rooms are not indicated on the floor plan that indicated on the furniture plan These plans and drawings give specific details of the lighting locations and their mounting positions, but they give no idea of the visual effect of the lighting in the room.

This remains the aspect of the interior designer that is difficult to present visually in advance of actual installation. efforts to develop computer programs ad producing images illustrating a space by a particular lighting, installation, and a continually to develop. There are many such programs and you should consult your lighting specialist when utilizing a new program. In general, however, it is the informed imagination of the designer that serves as the primary means for planning and predicting how lot really look in reality. The walls, ceiling and floor of a room reflect different amounts of lives. The holes on them depending on the surface color and finish, this is where the interior designer selects the most appropriate finishes with the most appropriate lighting.

The amount of light reflected from one of these surfaces is known and referred to throughout these lectures as reflectance value and it is measured as a percentage