I understand wanting to grow your own supply, but in order to get anything out of it, you almost always have to invest some money. Those two fluorescent bulbs aren't going to do much, and if you have passive exhaust, you basically mean there's just a hole for air to come in and out? Also, the temp needs to be around the mid 70's ideally. Over 80 and you are stressing the plants. You should also keep the humidity down or you are going to have moldy buds. I'm not a grower and I'm not trying to bag on you, but I don't think that your end product will be worth the three months of time and effort if the plants even make it that far.