you could use poly shield you can buy it here Purchase Poly Shield - Polyshield Thermal Imaging Defense but what kind of light are you going to use and how many plants are you going to have>?
you could buy Dutchmaster Superbud it increases you yeild by 30%. its kind of expensive but well worth it. Dutch Master nutrients & growth enhancers featuring Folitech Grow & folitech bloom penetrator
do you mean a 9v? if so yes it will work for like an hour. just cut the end off of an old cell phone charger and conect it to the computer i have 3 conected that way. you can get old phone chargers at good will for like 2$ for like a box of them.