Stair Lights is a low voltage (and this implies a low cost) LED system that will allow you to light up your stairs with or without a switch. The lights open up automatically when you are near the stairs, but they can also be controlled. There is also a generator connected to the system, so in case of a black out the stairs will still emit light for another 12 hours.  Each stair is illuminated by a three beam spotlight and all the wires are intelligently hidden. If you want to purchase the kit, it will cost you $140. However the kit only includes four sets of light so you will have to add $34.95 for every step starting with the fifth one. The overall cost will be quite high, but you might consider only adding light at every other step for example. – via Gadget Venue