For reasons of privacy, windows are smaller and curtains are used. We have begun to air-condition and soundproof rooms, where there is no scope of an open window. Therefore we have to resort to artificial lighting even in during the day. Filament lamps and Fluorescent tubes are the two common options in household illumination. The filament lamp is usually in the shape of a bulb, producing yellowish light.
Hotter filaments emit white light.
Filament lamps are available for a range of brightness. Decorative shades and chandeliers, provide illumination that is decorative. They emit plenty of heat. This is cool, efficient and consumes less power. It simulates natural light.