I've grown autos 3 times, all white dwarf. Each time I started with mainly 6500k light and went to 2700 for flower. The only difference was that I let the flowering change the light instead of the light change start the flowering. I'm sure the plants won't drop over and die either way, but I can't see what would be different about autoflowers that would make them not prefer bluer, springtime light for veg like other plants.