I saw this thread yesterday and my first thought was that plants looked 'lanky' or 'leggy' like they are not getting enough light. Otherwise, yep, they do look healthy.
As for the 3 blade leaves my thoughts are that it is another sign that the plants are not growing at their best right now. I really doubt that it is a sign that they are going into a revegetating stage. To me one clue is that the edges of the blades are a nice looking serrated edge just like a sharp saw. The edges are not smooth or just small dull points like when a plant has entered the revegatating stage. I often see the plant produce 3 blade leaves for awhile and then start growing the 5 blades on newer leaves. Come to think of it, tomatoes will often have different shaped leaves while the plant is young or if it is growing in a less than optimum location, usually in heavy shade.
Drop the lights down a bit more. Watch what they are reacting and adjust back up if they start to look like something is going drastically wrong. I have let some of my plants grow right into the LED lights with a few minor burns and they recovered just fine.
The first photo is from yesterday and the plant tops are at light level. Often the leaves would have to touch the back of the tubes of diodes which is where the metallic reflector is on my LED T5 lights. It takes a couple of days before burn marks start to show. And, yes, I deliberately left the purple pod stay on just to show how much detail is lost plus the underexposure when photos are taken under burple lights.
The second photo is from several years ago when the leaves had been touching the tubes for several days in a row The burn marks are just where they touched and the rest of the leaf was not touching. The burns do not heal but the rest of the leaf survived. And, new leaves do not show any damage.
As for the 3 blade leaves my thoughts are that it is another sign that the plants are not growing at their best right now. I really doubt that it is a sign that they are going into a revegetating stage. To me one clue is that the edges of the blades are a nice looking serrated edge just like a sharp saw. The edges are not smooth or just small dull points like when a plant has entered the revegatating stage. I often see the plant produce 3 blade leaves for awhile and then start growing the 5 blades on newer leaves. Come to think of it, tomatoes will often have different shaped leaves while the plant is young or if it is growing in a less than optimum location, usually in heavy shade.
Drop the lights down a bit more. Watch what they are reacting and adjust back up if they start to look like something is going drastically wrong. I have let some of my plants grow right into the LED lights with a few minor burns and they recovered just fine.
The first photo is from yesterday and the plant tops are at light level. Often the leaves would have to touch the back of the tubes of diodes which is where the metallic reflector is on my LED T5 lights. It takes a couple of days before burn marks start to show. And, yes, I deliberately left the purple pod stay on just to show how much detail is lost plus the underexposure when photos are taken under burple lights.
The second photo is from several years ago when the leaves had been touching the tubes for several days in a row The burn marks are just where they touched and the rest of the leaf was not touching. The burns do not heal but the rest of the leaf survived. And, new leaves do not show any damage.
As I mentioned the back of the tube is a reflector and that part gets really hot to the touch.
