It's a 4x4 and most of the canopy is about 15" with some tops around 4". 2 of them just won't stop growing taller. The flood tray underneath is 3x3. I have a journal going for these.
https://www.autoflower.org/threads/next-attempt-and-1st-journal.85662/ Ideally more light coverage would be great but I've never had plants get anywhere near this tall. And they have a net spreading them out! They were all flat under the net 2 weeks ago at 32" from light. None of these plants flowered in under 40 days and 2 of them didn't until the 50s, with the problem child still yet to get going, so they're way bigger then I was gunning for or used to. Gonna have to supercrop them eventually