i recently grew white widow for dutch passion , when my clones rooted threw the cloning blocks i put them into the pots for flowering and stuck the under 2 x 600 watt hps with a 11/13 light cycle. each planted ended up about 2 foot tall and each gave off a respectable min of 1 ounce each , with 2 giving an ounce and a half . i can fit 28 of these plants in a 4x4 space. so i reckon i can average at least 28 o's every 8 weeks or so . northenlights is a bigger producer than WW .
i hope this helps...
Hal