BigIrishDoode
Fallen Cannabis Warrior
I saw a box/whip type on flea bay,with digital temp control for 40-50$ dont know if it any good,but customer feedback was good, might be worth a shot
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The roots look like it was starving for oxygen. If you have the space, run a comparison test with coco coir and your soil 2L Hempy, you will noticed the coco will have whiter roots because the medium itself provided plenty of oyxygen and water retention to the root system. Perlite and vermiculite works the same. Soil holds water well but not enough air, and combined that with hempy style which leaves a small pool of water at the bottom will reduce the oxygen even more. Hence, you're seeing most of the brown happening in the lower region of where the pool of water (hempy) is. Soil gets its air exchange from water going in pulling air through as it leaves. With hempy it does not completely drain and the remaining water remains at the bottom. Reducing some of the oxygen exchange compare to the regular potting soil.
I'm no scientist but have seen roots devour oxygen that is why they thrive in hydroponic setup, and the video you've seen where Green House Seeds compare hydro and soil, hydro has much faster growth rate.