If ya want to gaurentee 2lb + some.... ya better go with 2 - 1000watt HPS...

HYDRO or AEROPONIC.. both are easier than ya think... : )
6000 watts and you got yourself 10+ pounds... 15lbs if your GOOD : )

CLONES galore... but remember the added risk with more plants comes the potential for more trouble... : (

good luck