another 2 would not go wrong and during the veg period you use the blue spectum,that is under 24/0 or 18/6 and the warm red bulbs during the flowering faze wich is when you turn your lights back to 12/12 this is usualy any time after 21 days veg . hope this helps and be safe.the postman. PS remember and keep the lights as close to the plant without burning the plant.