Abstract
The visibility of two luminaires was evaluated in the simulated street lighting system shown in Fig.1. One luminaire had an Upward Light Output Ratio (ULOR) of 12.6%, and the other had a zero ULOR. The visibility of pedestrians, colored objects, and the objects located out of the line of sight was evaluated, and an eye chart test was performed. To determine the contrast performance the veiling luminance (Lv) was calculated for the same lighting system and compared to the measured target luminance. We also investigated the effect of the different ULORs on older people. The results indicate that there are both advantages and disadvantages of the two ULORs and also show that the glare caused by the luminaire of the non-zero ULOR had an adverse effect.
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