Although these solar lights do power on, they haven't worked correctly at all.  They will not go on according to the settings.  When I choose the "solid" light mode, they stay solid for a few hours and then all of a sudden they start flashing....EVERY NIGHT.  I have them on the fence in my backyard.  And they do light up, however, not the way I'd like.  I even tried switching to the "flashing" mode thinking maybe the switch was backwards, but then they constantly flash!