The way it's set up around here is that part of the time there is a lot of naturally occuring light outside, and you can see far. Other times there is little natural light outside and you can't see far. There may well be human-engineered light, but it won't help you see as far as when there is a lot of natural light. Sometimes the transition between the time with lots of naturally occuring light and the time with much less naturally occuring light is pretty.