| 摘要 |
The port marker comprises a self-supporting half-ring of height greater than the height of the light source of lighting column, lighthouse or light signal. The lighting units are distributed between the two ends of the half-ring so as to be visible to a boat or vessel that approaches the port. The color of lighting unit depends upon the color of the lighting column, lighthouse or light signal. The lighting units are powered and controlled by an electronic unit. |
