I just git my NFT system grow kit, 250 watt and I have 2 kind of lights : Son T Plus bulb and Metal Halide bulb, which one should I use and for what period. Another thing is that I received 2 Vegetive nutrients and 2 Flowering nutrients bottles, with 2 types A and B. I didnt understand the difference.. As I am a beginner, I would appreciate all ur help. thx and cheers