Annual use of luminaire groups for the entrance area according to the orientation of the road tunnel

Annual use of luminaire groups for the entrance area according to the orientation of the road tunnel; Angel Pachamanov, Borislav Pregyov, Kiril Kassev. Adaptation tunnel lighting is performed with three or four groups of luminaires switched on or off when increasing or decreasing the adaptation brightness. The dependence between the operating power of the lighting and the duration of turning on the individual groups of luminaires varies with the different orientation of the tunnel portal. It is nonlinear, therefore the modes of operation and dimming of the groups of luminaires are determined by the so-called orderly schedule of adaptation brightness. It gives the frequency of occurrence of set values of adaptation brightness in the annual plan. For each orientation at the tunnel entrance, the ordered schedule is different, which is why the dimming mode of the luminaires from the available groups is different.