All those plants for a first grow?
Well, you are gonna have a hell of a steep learning curve.
First glaring issue is that light. Sorry to say but that is pretty much money down the drain. Blurples are a joke. Your plants are stretching too much and weak structure all due to insufficient light.
So this light isn’t any good? This is the one I have. I started out with lesser lights so they grew too tall as seedlings. They really didn’t start leafing out until I got a better light. My main concern now is the yellowing of the lower leaves.
Folks are pointing out your light because of the distance between nodes on the plant. The plant is asking for more light by stretching out like that.
These lights are affectionately known as burples for their purple light characteristic. Experienced growers avoid these type of light, as they are overrated in terms of wattage (your “1200 watt” light is actually 255 watts.) 255 watts is ordinarily okay, but you need to keep in mind that some of that wattage goes toward creating heat rather than light. You might consider returning the light if you can. They just don’t do a very good job.
You won’t be able to flower multiple plants with it. It might be enough to flower 1 plant.
They are around 8-10 weeks old. The light is around 37 inches above the plants. I’m not too worried about the other smaller plants. Just the big 5 that I have directly under the light. I know I started out with too many now but wasn’t aware when I started them. I will get better pictures as soon as I get home.
These plants will make good teachers and we (the ILGM family) will help you maximize your yield. The lessons you learn the hard way are permanent knowledge.
I would suggest dropping your light to not more than 24". Drop it slowly though, a couple of inches 2x a day maybe so as not to shock them.
She is a foot taller than the rest. My opinion is some just grow this way. I am in no way saying you have the right light, at the right hight, set on the right intensity. It does look like you got a mighty stretch going on.
If you have the scratch, look into an HLG. They are of extremely high quantity and very popular among the folks on this site.