a 1000w is really good coverage for about 4x4 is all. For other plants it's one thing but for our plant we pump up the light.

Just remember they will grow almost double the size or more before they are done. You only want the flowers to poke through the screen if you can. That's why you put the screen so high up on the canopy. They grow into it and fill it out 100%. If they get to tall you can tie them back to the screen too.