Light Connections (Help Needed!)

[4WalledKid]

As may know, candles, torches, etc. They don't caste any shadows (or maybe the do and I don't know how to do it. The only way of creating shadows is with a spotlight. I want that when the Player uses a tinderbox on a torch or whatever light source, an inactive spotlight becomes active in order to cast the shadows. Can someone please explain me how to do this? Thanks!