Don't worry about the expensive plant bulbs, simply buy a 23W or greater Daylight compact fluorescent bulb, 6300K to 6500K. You can also mix a cool white and a warm white bulb and get the same effect. You are trying to get both the blue spectrum (cool white) of light for growth as well as the red spectrum (warm white) for flowering. Any Home Depot or Lowes etc will have these bulbs.

Mike

Thank you Mike! You just saved me alot! I really appreciate your help.