They stretch for light. You get that when you have to lift your lights to get coverage and that light is overdistant for many plants and parts of them. That is their natural behaviour when they get 24W per plant average and that from the far distance.
What GHS declares is perfectly true if you get them enough light. I grow 3 of them, today one month old, 40 cm high. They make beautifull structure, started to grow very fast but will not go over 90, maybe 100 at the end. They do not grow up so much as they make strong side branches which are almost as long as main stem.
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