Radiosity renders take hours per frame but are worth the wait.

Decided to try something faster cause I dont have hours
to spare.
On looking at the above setup image. I wondered if 180 degree spotlights projecting (360) environmental images would be similar to radiosity?

Concluded they werent half as goog as real thing. But much better than spots alone, and at about 1/20 th the render time, and without all the hour long test renders, gotta say I am happy with those enviromental spots.