id say its more to do with node spacin lads not how big the plant is the g13 i did i vegged that under cfls was only 14" after 5 weeks veg was tiny but had 13 sets of nodes so by time it flowered it had around 16 which means 32 bud sites/side colas which means more bud the more you got. i could have vegged for a week or 2 under a 600w an the plant would have been same size but a lot less nodes so less bud sites there no point veggin a huge plant thats got spaced out nodes cos when you do flower an the plant streches the bottom nodes get left behind an dont fatten up like the tops do. i never flower till i have at least 10 nodes dont care about size/height never had a plant go over 3ft cos there always 10-14" when i flip but packed with nodes. soz for ramblin on lads still not sure if it makes sense lol just tryin to say you could have same strain same cut in same medium 1 under hps or sim an 1 under cfls or mh veg for same time say 3 week. the hps will be huge probs nearly 2ft the other will be props 10" but both will have the same amount of nodes ruffly but the small fucker will be more compact an wont strecg as much so all buds get better light pentration the streched fucker same nodes but cos its huge bottom buds get left out an dobt get enough light so even tho same strain same nodes an everythin you end up witl less bud.
rant over lmao