3week autos 40inches??

Has nothing to do with Height from lights. With FL the min rec distance is 45cm. With that and the ppfd.. you had to over been clocking over 700ppfd so more than enough to sustain a plant without causing a stretch. The spectrum with your led. Is designed and set to a exact standard for all types of growth. Full spectrum. When you add a new light. You need to match the spectrum that is needed in said stage of growth. Blue MH would of served you better until you out of the danger window of tricking your plant into thinking its been out-shadow. Trust me. Its your added FL light.. go through Tropicana Todd's diaries. He used FL/ HIDS but used the right spectrum at the right stage and amazing results. Next time. If you decide to add extra light from OG bulbs. Get a San light ballast kit Blue and red.

They look for the light and stretch, to fix this next time bring the light closer to them because in flowering they need stronger PPFD so they don't stretch like that download the PPFD meter 😎 I mean it looks like from the beginning they stretched and searched for the light. 🤔

Hi. So I tried mes on here. You're using a set led and then a full veg bloom light. You're throwing of the spectrum of the led. By adding a dif spectrum of red. Its stretched your plant. This can happen in pre flower. Next time while it's stretching. Drop the FL light. Or use blue to keep tight inters

The node spacing is not ideal but it could be that strain. It looks like you are passed the stretch faze now so they shouldn't stretch anymore. Could also be them not getting enough par light or the colour spectrum doesn't have enough blue. But most likely it's just a stretchy strain.

yes its fine it means your environment is dialed in