Recall that we have been piloting solar bollards on the dark bits of the West Bench walking path.  Although the lights are a bit underwhelming in the winter, their performance is much better in the summer (which is when most people use the path).  Part of the issue is that the lights have powersaving technology to avoid running the battery to zero before dawn. They switch to 30% output 5 hours after dusk, which is one of the reasons the lights are so dim on winter nights (dusk + 5 hours is still before my bedtime in December and January).