Be careful putting those leds too close, you can fry a young plant and really slow down the growth, lol. It looks healthy overall, don’t change too much. Yeah i have the led 12" from top of the plant now,was at 20". Im using 2 leds 1x150wat+ 1×100wat the temps have been on the lower side like. 29°C max but sits at around 25 during the day. And humidity is 40-50% i have 2 6"fans blowing air around. One 4" extractor exhaust fan and few holes for intake. So mate do you think if i can raise temps a couple degrees and say buy a humidifier to increase humidity ? To about 60%. Its very slow the growth. I thinkn about using the 1.2×1.2×2 tent? Be easier an temps get hotter in there. I have it in my closet right nw. 3.5×3.5×7 which is quite big. Also the pot is 18ltre and its obly filled 3/4 way to top. But is a plastic one an rather heavy when waterd. Takes about a week plus to dry out
Humidity, I bet, is part of the problem. That and container size.
If your temps are warm and humidity is low, the plant will grow slowly because of vapor pressure differential. If it is warm in there, get the relative humidity up around 60% if you can. If it is cool in there, then that will slow growth also. Cool and humid is really a dangerous spot to be, avoid that, but usually the lights keep it pretty warm.
Hey, do you have a fan creating some wind? Wind makes strong stems and faster growing plants. Fans everywhere, start a collection, seriously. Keep the air moving.
The pot is a little big for a small plant. Planting in smaller containers early on will foster faster growth, believe it or not. It allows the pot to dry at a faster rate for small and promotes root growth.