First off, what does it do? Second, I am going to buy a light soon. Should I buy any one over another? I think I am between a ballst 1 system or a digital one. The digital one is supposed to be more efficient. Any opinions or help is appriciated.
The ballast contains a power supply, capacitors, transformers and such that are needed to run an HPS or MH. Digial ballasts are supposed to be more efficient, have better output and not put out as much heat but are a bit more expensive at this time.
I have always used sun systems stuff, 5 year warranty on ballasts, pretty reliable. You probably want to go with an HPS if you want one light to do both veg. and flower.