6500k for veg (blueish white light)
2700k for flower (reddish yellow light)

Here is a site that explains diffrent lighting and color http://progressivegardening.com/plantgrowinglights.html

and here is a tek I started with http://www.totse.com/en/drugs/mariju...sgu191283.html

but that is JUST a start!
Hope that helps a little. Sabrina