I have been using these at my hangar home in Southern Arizona for over two years. They are still working and theyâ??re maintenance free. They have done well in the blistering heat. Seems like they illuminate right at sundown and then they work all night. I have driven over them many times with my heavy truck without any problem. Each unit has FOUR lights on it. I believe they are LEDs. Occasionally, one of these will not illuminate. I wouldâ??ve given these five stars but occasionally one of the lights will go out for a day or two. But then maybe after a day or two theyâ??ll work again. Donâ??t know why but itâ??s not related to temperature or humidity or amount of rainfall. So if you donâ??t want to do trenching to run conduit you might consider these