There are many china landscape lighting suppliers to consider when deciding how many step lights you need for your stairs. You should think about the length of the staircase, the height and width of each stair, as well as safety concerns like where people will be walking during nighttime hours.
If you have a short set of steps with only two or three risers, you may only need one or two step lights. If the steps are wider, then your lighting should be more evenly distributed across them to ensure safety and visibility.