Hi, I would like to control a light from 2 diffrents location. Location #1 , power and light wire. Location #2, only power availlable, no 3 wire ... can i connect a switch at location#2 without any de

Here is the situation. I would like to retrofit some lights in a stairwell to a basement. Existing wiring is available at the top of the stairs, I can get power to the bottom of the stairs but getting