A comparative analysis of lighting parameters on various road surfaces and different lamps

Abstract

This dissertation is about the analysis of lighting parameters of three types of lamps namely high pressure sodium vapour (HPSV), Metal Halide (MH) and Solar-Efficient Light Emitting Diodes (LED) using DIALux 4.13 lighting design software. These lamps are placed in three different arrangements i.e. zig-zag having dry road surface R1, opposite having wet road surface W2 and twin-central having concrete road surface C2. The traffic lighting class selected is ME4a. Lighting parameters such as average luminance (Lavg), overall uniformity (U0), uniformity index (UI), threshold increment (TI) & surround ratio (SR) have been calculated for these lamps in every arrangement. It has been found out that Lavg value is preferred for Solar-Efficient LED in zig-zag arrangement having dry road tarmac (R1). U0 value is preferred for HPSV & MH lamps in zig-zag arrangement having dry road tarmac (R1). UI value is preferred for HPSV lamps in twin-central arrangement having concrete road tarmac (C2). TI value is preferred for HPSV lamps in opposite arrangement having wet road tarmac (W2). SR value is preferred for Solar-Efficient LED in all arrangements for dry, wet and concrete roads R1, W2 and C2 respectively. Moreover, lighting parameters of the four observers were also analyzed. All the observers of Solar Efficient LED in the zig-zag pattern give the highest values. For U0, observer 1 and observer 4 of HPSV lamps in a zig-zag pattern gives the best value. For UI, observer 1 of HPSV lamp in opposite arrangement and for TI, best value is perceived by all observers of Solar Efficient LED in twin-central arrangement. The highest average illuminance (Eavg) yield is found to be 36 lux when Solar Efficient LED is arranged in a zig-zag pattern. The lowest Eavg is found to be 13 lux when HPSV lamps are arranged in a twin-central pattern. HPSV lamps give an average savings pay-back period of 13.03 years which is not viable. Solar Efficient LED lamps give an average savings pay-back period of 5.2 years which is viable.