The use is to put small lines of them on the sides of roads - to make driving safer in the night. I imagine them looking like little pumps, sitting in the center of a 1x1 field. It is totally ok if they only self-light enough to be clearly visible in the night.
Te current lights are too butal, use too much electricity for this use (and even maintaining an electrical grid is a pain over longer distances). I really just want to put one of those every 4-5 grid fields on both sides of the road so it is much clearer where the road border is in the night
