never done a 12/12 grow from seed, i always veg my seedgrowns for 6 weeks minimum, but i do take clones off my seedgrowns and rarely give them any longer than 4days veg time after theyve rooted, im not too worried about the yield from my clones because im just making use of what i normaly take off the bottom of my plants for air airflow and up until a couple of years ago i used to throw away! but 3 or 4 clones taken off each seedgrown plant really boosts my yields, i cant keep mother plants and continuously flower clones from the same plants because i get bored smoking the same weed all the time and i like something different from each harvest, anyway heres a lil pic of one of my church clones when it was 3 and a half weeks into 12/12 and only given 4 days veg after rooting, i normally yield anywhere between a half to an oz dry per clone, and 3-4 from each seedgrown. and i use 2 x 125w blue envirolites, well eco-lites, theyre the same thing, for veg and i think theyre excellent, gona upgrade to the 200w versions soon, i have to use my 600w hps badboy for flower tho. i have heard theyre gona be releasing a 400w envirolite next year