Stair Lights

All the stairs are carpeted, except the very bottom stair. This can create the illusion that the last step is actually part of the floor. I have several others have had close calls at this point. We have installed temporary lights that can be switched on. I have noticed a very attractive "LED Night Light with Motion Sensor" for only $15. However, I am trying to avoid using batteries and would like to install a permanent solution.

While I am doing the work, I hope to install similar lights at two small landings midway up the stairs and at the top so that any transition is marked. I believe that under the stairs is unused but closed-off space. I want to go exploring, but my better half knows that excavation could remain open for some time and has been reticent to let me go. Assuming I can look inside the walls, I think I can run wiring to the stair lights thru this space. Also, I have seen some nice designs in which lights turn on and off when a person is close, but I really just want a simple photo-cell. I think I would prefer a photo-cell integrated with the light, but might consider a photo-cell that controls all four.

I plan to use LED lights for longevity, lower power, and lower heat generated.