Don't do nothing but 2700k the growth process is so slow, I had nothing but 2700k 4ft 6bulbs on a T5 ballast 40,000 lumens and had the light cycle on 18/6 for veg, it took 2 months to barely make my plants 12" tall... just fork the money out for both 2700k and 6500k lights.. it's worth it...