Those in the dark are in no position to light the way for others.; Persons in the dark cannot light the way for others.
以其昏昏， 使人昭昭是不行的。
《新英汉大辞典》
2
When the sun goes down the solar trees will return to their original position to give off a full spectrum of light to the street and pedestrians below.
日落后“太阳树”会回复到最初的位置，发出全光谱光线，为下面的街道和行人提供照明。
3
A directional light doesn't have a position, only a direction.