6700k is fine. Kelvin is ONLY a measure of how the light looks to the human eye on a special black background. CRI (color rendering index) is a better measure...and a spectral graph is best.
In general, anything from 5000K to 10,000K is gonna keep plants very happy. Most of us mix our K
temps to achieve a color that looks good to our eyes and satisifes the plants needs.