Best spectrum for side lighting?

Hi All,

I have a 400W HPS. I am interested in getting some side lighting. Should I go for more 2,700K (BLOOM) spectrum or get some 6,400K (GROW) for a more diverse total spectrum?

Thanks!

I don't need or use sidelights until I'm into flower, so they are all 2700k.

I use the 2700k with the hps. 6500k with the mh if needed.