I'm a week and a half from harvest and this morning my 600w hps bulb burned out. I ordered another one this morning but it won't arrive for about ten days. In the meantime I hung a 250 w MH light over the girls to maintain the 12/12. Is this decrease in light wattage OK for a little more than a week. Half of my plants could be harvested today but a couple of them are a little longer flower time (white widow) and are still showing a majority of white pistils. I really don't think the buds are going to get any bigger. Do I have anything to worry about?