Optimization of the light distribution of luminaries for tunnel and street lighting

An optimization approach is discussed for the problem of designing light distributions for luminaries for tunnel and street lighting which satisfy luminance-based and glare-based requirements set by the International Commission on Illumination (CIE) and the European Committee for Standardization (CEN) while consuming minimal power. The problem is formulated as a linear optimization problem that incorporates the geometrical parameters of the lighting installation and the reflective properties of the road surface. A polynomial representation for the light intensities is used in order to construct smooth light distribution curves, so that the luminaries can be manufactured with existing technology. Computational experiments indicate that optimization models can substantially improve the lighting parameters of luminaries, and make lighting installations more energy-efficient.