I am having trouble with this caustics concept, i can find no tutorials on this, the only one i did find was in blender version 2.49 and didn’t help much.

basically i am trying to make water that has caustics, i do understand that you need a lot of photons to make the render look very nice, but the only place i can find photon settings is in the object settings for objects and not lamps and what not, so i am stumped. because somewhere (cant remember where) it said that i need photon lighting which really confused me.

a blend file would be much appreciated.