if your finances allow i would get hps. there is no comparing cfl buds to hps buds. if you do have to stay with the 42's i would get 4 or 5 more at least to get a decent yeild. i used to have a scrog cabinet with 4 42's 1 125watt vitelume cfl and a 65watt aquarium cfl strip and the yeild was about a qp every harvest.