Trichome Wonders under EVO5-150

After germination I put the seeds into small pots (0,25 liter) filled with Light-Mix from Goldlabel.nl and let them grow under the light of ONE SINGLE LED-lamp the SW4 from SANlight. The lamp hangs 50 cm above the babies and is easily strong enough from a good growth after germination. During the first few weeks I only give them ph-neutralized water with some BIO NOVA Roots. The BN-Roots will enhance the growth of the roots and give the babies a healthy start. I had them in the small pots almost too long... after 20 days the roots are coming out of the bottom already and the stems are pretty thick. Some plants start to get yellow, which I assume is from getting root-bound. When the roots run out of space and start to grow against the sides of the pot, the plant will stop to grow upwards. Therefore I have to transplant them into bigger containers asap...