your going to want to top that plant imo, its already taller than it should be if you plan on using very little lighting. i'd add at least 6-8 more 26w bulbs, using at least 3-4 of those for sidelightibg. (get a mixed spectrum btw.) its an investment. youll have them for your next grows. well worth the 40 max it would take to upgrade your system like ive indicated. youve got some potential there and even if it is a bit more stretched im sure youll get at least an 1/8-1/4 off of it. that would run you like 60-120bucks here, look at that, only 1 grow and your pretty much for sure in the green financially wise on your investment. if you veg that long next time with like 8-9 bulbs and lst or scrog your plant i can see you pulling an ounce or more pretty easy. so it just keeps getting better.