This is entirely dependent on the type of fixture you are using and the grow room space you have to work with. For a hobbyist or small scale home grower, a 2x2' Growtech160 could easily grow 2-3 plants in a 3x3' area. This can be doubled when using a larger fixture like the 2x4' Growtech320. Multiple fixtures would be needed in large commercial grow spaces.
Grow rooms come in a variety of shapes and sizes, each one with it's own unique lighting needs. Contact us for recommendations on how to properly light your grow room.