I would investigate what these white/red/blue means. If red is for infrared then it's better to turn off this during seedling and veg because it promotes stretching, which is undesired in limited space and actually useless if not in flowering. White (or blue) might stand for ulraviolet, which is great for seedling and veg, and the third one should be the normal spectrum which is always on. I suggest you to investigate the meaning of these switches, if uncertain you can leave all 3 on, it won't harm the plant anyway, but stretching from infrared can be annoying as space is being taken for nothing