Influence of tunnel lighting system installation modes and parameters on energy saving

Abstract

In order to quantitatively analyze the influence of the installation mode as well as the parameters of luminaires on energy saving for tunnel lighting, particularly in regard to the installation angle, a point-by-point method was adopted so as to calculate illuminance and luminance, and a simulation analysis software was developed. The illuminance and luminance obtained by symmetrical, staggered and unilateral modes, as well as pro-beam and anti-beam configurations and different installation parameters, were quantitatively studied to evaluate effects on energy-saving. The obtained results demonstrated that the installation angle of the luminaires directly affected light efficiency when the luminaires were mounted symmetrically on both sides. Moreover, no significant difference in the quality indexes between the staggered arrangement and symmetrical arrangement were present. The illumination of the road surface was only 76% of that of the symmetrical arrangement when the luminaires were installed unilaterally. In addition, the luminance on the road surface was about 33% higher than that of the symmetrical configuration when the anti-beam configuration was adopted. The analytical conclusions attained by this study may encourage lighting designers to pay more attention to the installation parameters of luminaires and carry out on-site installation guidance.