Hey - First time grower...KB bagseed plants are about 5-6 weeks old, tallest is 7 or 8 inches...Growing in my closet in a Scott's/Miracle-Gro soil & perlite mix (drains exceptionally well), I'm using CFL's and FL tubes @ a total of 140-150 watts (10,000 lumens or so) running 24/7...the biggest...