Are you using the halogen as a heat source or a light source primarily?
While they throw heat and may be useful in a pinch to raise temps in a chilly closet, their light spectrum is less than ideal for growing plants.

You are also going to want to go into a pot of fresh dirt that is at least 4 gallons for that nice big plant! It looks to be over 2 feet already so go for a 5 gallon pot with great drainage to give it room to finish. More root space means better bud production.

The plant looks quite healthy overall.