Lumens help

So i read in the faq that the veg stage needs more lumens then the flowering stage. I always thought this was the opposite as the more light you have the more bud you will get during flowering? the faq states:

Q. Which bulbs are for Vegetative Growth?
A. 6500K (Daylight)
Q. Which bulbs are for Flowering Growth?
A. 2700K (Soft white)

so i'm a bit confused. the less light during flowering the better?

those kelvin ratings are the spectrum (color) of light.
lumens is the measure of light.
hope this helps