Light for herbs

[ohman11]

I am planning on getting things set up inside again because it is getting so hot here in Texas. I grew my herbs inside this winter with t8's and now I have got a nice 1000 watt light and have been wondering if I was to use it how many hours a day would I need to run it. Or.....do you think I am better off just using the fluorescent lights? I can run them 18 hours a day pretty cheap but this is not so with a 1000 watt hps or MH? What are your thoughts?