Ner0zanswered grow question 3 years ago You'll have to get a feel for it. It depends on the size of your grow area as well. For seedling I'd jack that shit up to the top and maybe 10-20%. They don't need much at all. 3-4 nodes I'd drop to 24" 30%, then up 10% ever 4-5 days. In flower you should be up to 100% 16-18" if you're in a 4x4. For then veg % monitor node spacing if they're getting lanky up the %, if nodes are ridiculously tight and you're seeing the leaves curl up into a canoe turn that shit down.