What light are you using . Mine look kinda like yours . What are you growing in and what are you feeding them .
 

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2x4 tent with 2 copperhead led c9 at 6' above 2 7gal smart pots filled with Oregon's Only #4, fed with reverse osmosis and nectar for the gods.
 
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When you put your hand over the top of the plant can you feel heat from the light . I’m not familiar with leds but I know they can burn plants if there to close .
 
When you grow in a container of that size, the roots have tons of room to grow. The downside is that it may seem like the growth is slowed down. I'm going through the same issues with my plants, 5 gallon containers and the roots are finally going deep down into the containers (after 3 weeks starting from clones.) The plus side is that your plants will get huge assuming you veg them long enough.
 
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Lowered the lights to 4' above top of pot and girls are perking up. Thinking about leaving the lights at this elevation for a day and see if they perk up any more. Maybe need to lower them down another 12" or so. Really just trying to figure this stuff out. Trial and error...
 
Changed the lights on the last two pictures the 9th. They are the plants from the original post. Had two separate lights going on two separate tents with all else equal. These two were not performing as well so they are now all under the same lights. The two are stunted bad compared to their sisters. All the same ILGM white widow auto. So far only had two beans not germinate out of 13.
As a side note: switched both setups to 24/0 lights on the 7th. (Day of the original post)
 
Why did you switch to 24hr on? Keep your light like 2-3 feet above the plant tops. 6' is way too high. Looks good though.

How long you going to let them go before you flip to 12/12?

I just looked up the specs for the light your using. On Amazon it says in veg the light should be 32" above the plants ,and between 18--26" in flower. Hope this helps.
 
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I had the copperhead lights at that height at the suggestion of another person with those lights.

At the same time in another tent was running another manufacturer's lights at the same as a comparison. All else equal, the plants under the copperhead light were not performing as well as the plants under the other light.

So, lowered all lights to the same elevation of 30" above canopy.

No difference in performance, the two still lagged and began to shape up as midgets. Everything on those two plants are miniature versions of plants under the other light.

Changed out the lights over the midgets to the same as the others. Trimmed the old crusty foliage off of one midget and left the other as is. They are all auto flower of the same batch of seeds from the same breeder. Since the midgets are already fucked up, figured what the hell might as well experiment with defoliation versus not.
 
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