I grow all my sarracenia and vfts next to a windows like your, but west faced. I have 4 big tables with my plants on it, and they get 3 to 4 hours of direct sun. And i have 2 T5 54w with reflectors over the plants for 16hrs a day(in summer), so the plants have both for 3 hours.

To tell the truth, i cannot see the difference between my plants and the ones growing in fullsun. Very colorfull.
When fall comes up, i let the window open in the room and the plants go slowly dormant. And when i have no new growth for 2 weeks, i put the dormant plants in the fridg in a sealed bag at 4C until feb.