Actually it depends on strain. My experience is that plants show depending on maturity. If they've vegged long enough (6-8 weeks) they will show before the 12/12 switch. But they usually show within a week or two if mature enough...otherwise it could take longer.I would change that light schedule.plants need the 12 hrs. Of complete darkness to flower.usually it takes about 3 wks after switching to 12/12 to see the sex of the plant.if you do keep your Cfl's i close proximity to the plant(s) be sure to keep a fan blowing at the bulbs ad some cfls tend to get pretty hot.good luck bro