Call me old-fashioned, but I like to stick to a strict regiment of 6400K bulbs only during the veg cycle, and 2700K bulbs only during the bloom cycle. Those are the spectrums the plants benefit from the most during the respective cycles.
People might suggest you mix the spectrums, stacking more 6400K bulbs than 2700K during veg, and vice versa during bloom, so it's up to you.
Of course, I would definitely mix the spectrums if you're growing an auto-flower.
Any more details on your grow?
Peace