| 摘要 |
The illumination device has a lamp fixing on the upper end of the support rod standing on the walkway to be located in a side of the roadway. An inside circumferential surface of the lamp fixing has a first arrangement surface inclined upwardly from the walkway to the roadway and a second arrangement surface inclined upwardly from the roadway to the walkway. The first arrangement surface and the second arrangement surface are provided with the light emitting diodes, respectively. The color of the light of the light emitting diode on the first arrangement surface and the second arrangement surface are set such that the S/P ratio of the scotopic luminance to the photopic luminance of the light emitting diode on the second arrangement surface is greater than that of the first arrangement surface. |
