I have 16 going under a 600 watt hps. They are in 1 gallon smart pots. If you do not know what a smart pot is look them up and buy them. You can get larger plants out of smaller containers. I know people that have gone from 5 gallon to 2 gallon and increased their yield. I have lowryder hybrids though. Lemon skunk, hindu kush, and bluberry. They love the smart pots!