In recent years, illuminations, in which buildings, bridges, gardens, roadside trees and soon, are illuminated during the night time to make them stand out in the darkness, have been widely practiced. These illuminations are thoroughly designed considering city views and environment, and various light sources are selected to realize the purposes. This article introduces characteristics, technical trends, and some case studies of light sources used in the illuminations, including conventional light sources such as incandescent lamps, fluorescent lamps, high pressure mercury lamps, and metal halide lamps, as well as LED light sources that are now quickly becoming popular.
抄録全体を表示