| 摘要 |
A luminaire 1 configured to illuminate a road sign comprises a lighting unit 9 comprising a plurality of light emitting diodes; at least one photovoltaic power source 5 configured to provide power to the lighting unit; storage means 7 for storing energy from the photovoltaic power source and providing the stored energy to the lighting unit; an ambient light detector 11 configured to monitor changes in the ambient light over a time interval and a controller 3 configured to receive an input from the ambient light detector and in response to the received input control the brightness level of the lighting unit by changing the brightness of the light emitting diodes. |
