For now you have enough light but in soon future that wont be enough !
You have a large closet . What are dimensions ?

For that space a 400 w hps would be great ! She have around 45000 lumen's ! You need at least 25000 lumen's per sq/m !

You can grow your plants with less then 25000 lumen's but they will be poor !

Ventilation => try to put a exhaust fan in the closet because when you go on 12/12 the closet must be light proof . Thats mean that your door must be closed !

For now you must install more light !