CFL Closet Grow

Hello youtube! We are new to growing indoors. Official legal registered patients. Trying to figure out why our plants aren't growing as fast as those we've seen using similar set ups. Using three CFL daylight 28-watt bulbs. Using a 16 hour light cycle. A 24 hour cycle isn't an option for us. Using Fox Ocean Forrest soil purchased at a grow store here locally. We're open to tips on how we can improve the health and growth of our plants. Thanks for viewing! Happy medicating!!