By 'enclosed ballast' are you talking about the lights with the ballast attached on top? If so I had one (my first light) and it was too hot for the closet. I had to set it up in a shed. Also, they are very heavy and extra caution needs to be in there when hanging it. We all have read about growers having their light hanger break and fall onto their plants, eh? I'm just afraid you are going to have heat problems having your ballast inside the closet. I believe you will need to go with a remote ballast as the heat from the bulb will cause you enough heat probs and the added ballast can only add to it...or put your grow in a place that has better ventilation.