We're generally referring to the 315's in this thread, the 630's are just running 2x 315's in one hood. They require specific ballast which is what makes them more efficient than even the 860w "CMH", they could potentially fire under other ballasts but you won't get the same efficiency or even spectrum output than the ballast specifically made to fire and run the 315's. I think
@ttystikk had tried a couple of ballasts running the 860w bulbs but found the actual power usage was the same as running 1000w bulb which kind of kills the efficiency factor.
LEC = Light Emitting Ceramic (e.g. Suns Systems 315e LEC)
CMH = Ceramic Metal Halide
Both = same thing, just different terminology
Unfortunately there doesn't seem to be any options but replacing your ballast if you're looking to run the 315's. They do have them available in mogul format for the sockets so they could run inside an hps hood but the ballast doesn't seem to be an option, or at least I haven't seen anyone trying to run those 315's off hps/mh ballasts...