Stuff like this is actually pretty easy to do, with regard to the electronics portion. If you're building a new house or doing some fairly significant renovations, then you can do this kind of stuff with a fairly minor increase to the total cost. Now if you want to retrofit an existing house or apartment with these sorts of features, that is a major PIA! It's like adding structured ethernet to an old house... you can do it, but it's very time consuming, and it never turns out exactly like you want it.
[citation][nom]sliem[/nom]Yes, it's only reasonable to install on a new house (ie: still under construction)... installing it on existing house would be pain in the arse and probably would not justify the cost on either case.[/citation]
Why they are led's I bet you could do it off of some batteries instead of running wire. The batteries would still last longer than an incondecent
[citation][nom]Gin Fushicho[/nom]I could use a couple of these. I fall on the stairs every time I try to go up them at night, they're in a super dark hallway with no light.I don't see why you would need one for every step however.[/citation]
For when you feel like dancing like MJ of course, can't do that without the lightup stairs.