I would recommend a 3:1 or 4:1 ratio of 2700k:6500k
^ = winsauce.
The reason being, the plant requires Daylight during veg, and then Soft White during flower. If you give it all Soft White it will 'stretch' just as if you planted it in shadow and it was not getting enough light.
The good news is that the plant does not require a lot of Daylight to get through veg, and even while in flower some Daylight still helps. So a 3 Soft White: 1 Daylight is a good all-around mix. That way you don't have to worry about swapping bulbs and whatnot.
But if you want to bring it straight into flower and leave it at that, than yes, you can use just Soft White. Lots of people do. Personally, I'd toss in a couple Daylights just to balance it, but that's up to you.