What Spectrum for autos?

i am about to start my first lowryder#2 grow and i was wondering if light spectrum matters with autos?if so what is the best? i have 6400k lights should i get some lower spectrum?

Yes the 2700k bulbs are for flowering cause its more in the red spectrum. Hope this helps!

so then should I keep the 2700k bulbs on the whole life cycle or last six weeks?

Yes from seed I used 6 to 8....100 watt equivalent 2700K CFL's. Then I also used about 4 6500K CFL bulbs also for the vegging. But I think the 6500K is more about personal preference I did it just to experiment. But I ended up getting over 9 ounces wet. So that is a little over 2 ounces once it dries. You can see my Auto on the last few pages of my grow in my Signature!