that will be fine. the plants can handle a lot of light during DSM. Keep the soil wet, more than just moist. also keep a LITTLE air opening. having a complete seal will increase your risk for mold. you dont need it to be super humid inside, just wet for the plants to root. I've heard people do 12-14 hours a day for DSM. I did 8 for mine with medium high light. had no problems.