If you are worried that you might lose a disc, you probably will, don't throw your prized discs, and make sure your lights are secure prior to league play.
We played night golf last week at McGraft and it was tough at times. I would recommend ribbons as well as LEDs(the brighter the better street lights on the top are a ****). The main thing is having a good idea what you are throwing, and where it is going to go. the rest us up to luck and good fortune with trees and toxic water. . hopefully we will get some melt down before then
p.s. don't fret