I mean I'm not an expert...it's my first grow. But I have a one-month 2-week old sour D that I've been topping and Tying down with heavy paper clips to keep it low while my other plants who are a month behind catch up.....The point I'm trying to make is my Stem is half that Size
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And My total plant is a bush monster
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View attachment 4851160 or twice the height of the plant.....I have it bent at a 90-degree angle in attempt to keep it short so it doesn't outgrow my garden. I've read about a million forums and pages about growing....so I'm a"backseat" expert lol but you're only using like 660 watts actual draw plus whatever that 65watt cfl is...I don't know about those but I assume they use the wattage they are labeled as. So cheaper LEDs (I have a Spider Farmer 2000W actual 202 watt) advertise things that aren't true...You don't have the equalivant 1000w HPS + with that Mars and Depending on what model they really drop off if you have the D..But I digress you have the equalivant 700watt of usage. and with almost 50 square feet you have 15 watts per square foot which is severely underpowered....
You would do well with another 1000w HPS and that would give you 36 watts per square foot to get the yields you truly can out of Sativa's. With you're height I'd recommend at least 600W preferably 1000w"Actual" draw LED's. Or Invest in a Ton of Side lighting but you need to get your light to at least 25w per square Foot. If you had that I would Guess 4 to 6 ounces per plant...right now you are looking at 2 oz's MAYBE of fluffy Sativa buds that might take 4 months to finish...