Brightlight is constructing a boutique hotel with 200 guest rooms, and a lighting system that would best suit the rooms has to be decided. Given a choice between conventional incandescent bulbs and compact fluorescent bulbs (CFLs), CFLs are the best option as they have longer lives, consume less energy and are cost effective.
Incandescent bulbs contain a tungsten filament which, when heated to high temperature glows and emits light. But, most of the electricity is wasted as heat and only a part is converted into light. Whereas in CFLs, vaporized mercury emits ultraviolet radiation, this in turn excites fluorescent phosphor coating in the bulb ...