I run a 250 watt SonAgro (enhanced red spectrum) Metal Halide setup.
I start out seeds or clones in small pots and mid veg bump em up to either the 3 gallon pot or the 5 gallon, depends on what is available.
I just feed when the plants tell me they need it, after a couple of run ins with fert burn I decided to stop telling the plants what they wanted to eat.