help confused about plant/lighting

hi guys last time wiht my 600W hps i pulled back 16 oz dry from 9 plants

right now im using the same 600w under 2 plants and i dnt think im goign to get 8 0z per plant...how comes i fort it was not the amount of plants but the amoubt of light...they have had a longer veg time than last time aswell

well...the lights don't dictate how much bud yer gonna get..ALL of the environment added up together tell you that...So just run more plants next time again? Try using co2 to increase the plant metabolism?

so many factors influence final yeild man. Lighting is a key component but so are ...

1.) strain - some grow bigger and yield more than others.
2.) nutriets
3.) garden conditions - air circulation, frequency with which the plants are watered, trimmed, ect.
4.) veg time for sure - if you veg it out longer you will, of course wind up with a larger finished plant.

Aside from those mentioned above there are a ton of X-factors than can inhibit or further final yield

its th same strain....same feeding schedule.... same environment just less plants :S

gardens are like boxes of chocolates ...

Seriously though on my last run I did four autos, same everything for all of them. One yielded about 60ish grams (the largest), the smallest a half oz.