Sour Diesel auto plants not growing

Grow Cycle Seedling
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From a fellow grower:

I bought sour diesel auto seeds and started the germination of four of them on April 4th. I am now on week 5.

I have them in a 4’x4’ grow tent, humidity 50-55%, using two Famurs TF1200 lights. Started them in Rapid Rooters, then solo cups, then fabric bags using Frog Tree Potting soil and Extreme Mykos on the roots when transplanting.

No nutrient until third node and full leaf appeared using Big Grow and Big Bloom as per manufacturers instructions. I keep the temperature in tent between 70-74F

Lighting has been per Famurs instructions, 24” at 50% power first two weeks, 20” @ 75% power next two weeks, and now 20” @ 90-100% power. 16 hours on, 8 hours off in complete darkness.

Soil is watered every third day or until the top several inches feels dry and/or the container feels light. I also have an auto water system that insures watering every three days for insurance. Minimal water is given during that period. I have full ventilation to the exterior of the house using and inline squirrel cage ventilator fan and fresh room air being brought in through a bottom vent with a small fan inside tent circulating the air.

I am concerned about the growth, they seem far from being as big as they should be. I am including the pictures of today end of week 4. Any idea what’s going on here or are things like they should be? Suggestions?

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Off the top of my head that early into the grow cycle your humidity should be higher

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This is where I got hung up. Fox farms liquid nutrients are usually too intense to actually be applied at the rate that’s listed on the bottle. Often times when feeding with FF nutrients, I would cut it down to 25% of the recommended amount and if they seemed hungry still, bump up to 50% of recommended.

Is it possible to get the PPMs of the nutrient solution going in? And the pH, for that matter?

I am suspicious that a bit of stunting may have occurred as a result of too many “harsher” nutrients in the soil. That said, they seem visually okay - mostly healthy. They’ll grow more. Especially if you can curb the nutrients some and keep an eye on PPMs in/out.

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Looking at the specs on the lights it seems they are 110watt units.
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Two of them gives you 220 watts in a 4x4 (16 square ft) Gives you 13.75 watts per square ft.
If they truly have Samsung lm301h diodes as stated you will want 35 to 40 watts per square ft.
Regardless of what they say two of them are not adequate for a 4x4 space.

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@ILGM.Support How much water is going in your pots the soil looks really dry

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I’m going with @Spiney_norman way low on light need probably at least 480 watts of quality light for the space

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