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I'd say upwards of 4 pounds if you run into no problems from here on out. I yielded 2.7 pounds in the same space using 1200 watts of LED lighting in 12 weeks. Your veg was twice the length of mine so you should be able to get that extra 1+ pounds from that alone. I'm aiming for 4 pounds again on my current grow. Same veg time but this time I have an extra plant and I'm not making the same mistakes as last time. Anyways good luck! I'll be following :)
That much light (assuming bulbs are new-ish), decent care, geez 1200 grams or so.
I say this as I have a 4x4 with a 600w HID and 150w LED and you should be getting about twice what I do.
Kind of early to do this though aint it 😎