ya plants lower section is budding because of the fan leaves blocking the light, if its on 16hr then ur gonna need to do something about the lower section because it thinks its time, on a lighter note u wont get much outa the bottom anyways so id just snip the bottoms and move on lol

. another thing u might wanna try is vegging with flouros and flowering with HPS, the flourescents are easier on the plants from my experience, instead of whole dark green hardy leaves it brings a more softer affect and from my exp, i like the buds better from flouro to hps. just an idea puttin it out there