| 摘要 |
<p>Lighting device having a ring-shaped housing defining a side surface having therein a number of air outflow openings, and transversely to the side surface a substantially open air entry surface, an array of wind vanes rotatable around an axis that is mounted in the housing, along a circular trajectory in the housing and a light active surface situated in a central area within the circular trajectory of the wind vanes, substantially parallel to the air entry surface, a cleaning member or the light active surface being attached to the wind vanes for causing relative motion of the cleaning member along the light-active surface.</p> |
