I get pretty close nodes from 3500k that I actually bought some 3000k (because i need/like the extra stretch to fill my canopy).
It might be best to read about other people's experience aswell.
I veg under 5000k and my plants love it. You can really veg under any spectrum from 3000k and up. I also had good results vegging under 3500k 90cri with my Photon 180. Even 3000k in 80 and 90 cri will veg good.