Depending on your tastes and whatever it is that you're trying to get working, this is an interesting option and for me, this weird combo worked out pretty cool (if it suits your scene).

It's just a standard light cone but I turned up the intensity to 200 and changed the color of the light to gray and turned the intensity down to 10%.  Then I put in an additional normal spotlight set to 100%.

I really like this result plus it gives you a lot of control of things (plus there's GI).

-Kix