Would this even produce any weed?
Oh, sure, but you're probably better off vegging another month or so once you get your lighting up to speed. You've waited this long; might as well wait an extra few weeks to get some decent yield and make it worthwhile.
It's amazing how much plants can put up with and how long they can wait and still turn out great. About 5 years ago, my wife's ex-husband had a motorcycle accident just when his clones were ready to up pot. He was in the hospital for 3 months. His girlfriend kept them watered, but didn't know how to do anything else. She finally asked me to help after about 2 months, and those plants were just screaming to be repotted. They were in 3-inch square pots, and they were a foot and a half tall. I really didn't know if they were going to survive; they looked awful.
I spent an afternoon up potting them, and by the time he got home they were in full flower and healthy as heck. Every one of them made it. He got over 2 pounds out of that run. And your plants are a lot better looking than his were by the time I potted them. Yours can wait a month... remember, it's a weed. And a tough one, at that.
It sounds as though this is your first grow. If that's true, then I don't know where you did your reading, but it looks to me as though you're reading the right things. These look like very healthy plants, especially for the first time out. You know what you're doing, so keep doing it. You're off to a good start. Just keep learning. My gut feeling is you have a good sense of how to grow plants, and that's something you can't learn from a million websites.
I can't give you much advice about LED, because I've never used it. I use HID lighting and just blitz 'em with photons. I can tell you that those plants aren't getting proper lighting, but that's about all I can say. Good plants start with good roots, and good roots need good lights. Light is what converts water and nutrients into roots and foliage. Skimp on the lighting, and you'll affect the entire process.
As an example, see this photo. Both of these plants were sitting in a 400W seedling tent, along with about 45 others, waiting for the plants in a 1000W tent to finish so they could move into that tent. The other plants were slow to finish, so these plants sat about 2 weeks longer than they should have. When I transplanted them from 2 oz cups into 12 oz cups, I moved most of them straight to the 1000W tent, but about 8 of them had to stay in the 400W tent an extra 4 days.
Look at the difference in these root systems. The one on the right was less than 4 days after being put under a 1000W light, the one on the left had spent those 4 days under a 400. The only thing different during those 4 days was the lighting.
