These were easy to install and give off bright light, but they don't work well for a couple of reasons. First, we put them on the vertical backs of our deck stairs, which don't have much of an overhang from the step above. The lights stick out further than I anticipated. As a result, people walking up the stairs (especially kids) are constantly kicking them. Second, they are made of rather cheap feeling plastic, so many of the lights cracked very quickly as a result of the kicking.  Finally, even the ones that haven't cracked yet don't stay straight, because they only have one center hole to attach them so they skew easily. We did use two on a deck railing, and I will say those work much better. But I would not recommend them for use on stairs. After only one year, I am going to have to buy something sturdier for the steps.