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When I stay at ordinary hotels in the United States it seems there is rarely or never any central light. The entryway usually has an overhead light, but the room itself usually just has lamps, so to light up the room I have to go around turning on lamps (in the dark). By contrast, in private homes usually each room has a central light and there is a switch by the door, so as you enter you can flip the switch and the room lights up. Why do hotels use lamps and have no central overhead light?