Id just get them to 2 weeks then use your metal halide, you could set them near a window in the day-light for extra kelvins and lumens till there 2 weeks. Also on lights there is a kelvin temperature idealy they should be at 6500k the one's they sell at wall-mart wont work to well, id check out home depot for the high kelvin &lumen kind. also you need to get those cfl's 1 to 2 inches from your plants when they pop up or there going to stretch too much and fall over killing them.