U can grow them up to a certain point but you will need more light as they get bigger! I just recently purchased some T10 lights, they seem to run really hot i got the 60w ones and cant run them in my cab due to the high heat they produce but the plants love them from what i seen, after only running them for a little while the plants were already growing to those lights over my 45 and 60watt CFL's. Happy Growing!