No real rule whatever light s the stairs . I have no night lights for my stairs just the light overhead .

Is this a new build or existing space, what are you thinking about adding? The idea is that you need to see the stairs at night, so a dim led strip that runs the length of the stairs and just lights the stairs would be something I would consider if I had stairs. I also like the single lights under each stair that lights the step below, but I wouldn't want to have that wired after the stairs were in place. If your looking for an overhead lighting or wall sconces I would do like Patricia and just have a light. If it bothers you to have it too brightly lit you could put the lights on a dimmer.

There are dozens of different built-in permanent fixtures to light a stairway, and 50 different ways to do it. For most products, you don't get to choose the lumens and color temperature for a "night time safety" fixture - they are set based on the style and how it will emit that light. And the lumens could range from 10 to 500, and the color from 2700K to 6000K.