What, you don't support the oil companies lol? I have grown pure sativas indoors that would make the best veteran growers faint. I have trained sativas and grown them successfully indoors by topping at will..... and that included topping during flowering. Those pure sativas were stuff like TFD's Original Haze, Zamal sativa (straight from Christopher of La Reunion, a french breeder who was shocked to find out I was growing his stuff indoors), Dalat Vietnamese (seeds sourced directly from the Dalat highlands of Vietnam) and Mexican sativa. Of course some of the best laid plans don't work. For instance, here is a shot of a Dalat Viet which I let grow outside of the garden's footprint, had no choice, ran out of headroom. It was just plain uncontrollable and took forever to bring to a flowering response, I'm talking months. Want a good laugh and a REAL challenge, look at this hehe! On the right is a C99 X Dalat cross that my bud and I did, left outside of the lamp footprint. I mailed him pollen from a choice first generation C99 and he did the dirty deed with his Vietnam ladies. Needless to say, the C99 influence did not show. As an aside, so much for the paradigm that sativa requires super amounts of light LOL.
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Speaking of 'gravity', yield was excellent using HPS and Wallymart foods ("because they work"), so much so that I had to support the massive colas with chains from above. This shot is about 6 months from seed germination, not yet ready to harvest. Needless to say, leaf retention was a challenge for such an old indoor plant in a 3 gallon pot.
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Grow hard,
UB