Originally Posted by slunt

Bigger is always better but 2 gallon will support a root system for a plant about 2-1/2 - 3' tall. Of Course you can use bigger pots but then you will get less plants under the light. Also remember that after 3 feet a 1000w bulbs lumens have dropped off sharply and the plant gets very little useful light energy beyond that range so trying to grow a taller plant with only one bulb does not yield a preportionate amount of weed as on a shorter plant. You may get 1 oz off of the first 2 feet and only 1/2 oz. off of the last 2 feet if you go taller.