box lights or spot lights?

[Rapture]

(1a) Spotlights really far away make blocky shadows.

(1b) Change the Alphas of them to 0, that will save alot of performance.

(1c) Use a low intensity boxlight if you have moon (or sun) out + spotlights.

About the "broken shapes" can you a post a image? I'm not sure what your talking about.

(1d) Boxlights don't generate any shadows that I'm aware of.