Hello Kmint. For Autos, I have found that they start off better for me under just the veg spectrum(6500K) only. And after about 3 weeks, I like a 50/50 mixed spectrum. But a mixed will work from the beginning too if you wish. So if you have four bulbs of each spectrum or rather just four of the 6500K, I say use them for the first few weeks then switch two out for the flowering(2500K) spectrum. My
Agree with Squid pretty much. A couple of T-5's should get you through the seedling phase fine (until you have a couple sets of true leaves). After that, if all I had was the four bulbs, I would increase the light regardless of the spectrum.
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