| 摘要 |
<p>The device (10) has a light source (40) fitted for transmission of light, and a light intensity measuring unit for measuring a light intensity around a bicycle. A lighting control unit (42) switches on the light source with a color and with a bright condition, and the measuring unit measures a light intensity, which does not lie below a pre-determined light intensity. The light source is switched on with another color and with a dark condition, and the measuring unit measures a light intensity, which lies below the pre-determined light intensity.</p> |
