In my home office room (10.5 m²/115 sq. ft), I used to have 4 neutral-white (3000K) LED bulbs of average brightness (450 lm).
I replaced them with the same number of cool-white (6000K), super bright LED bulbs (900 lm). What a difference! It took a few days to get used to it, but I am very happy with the change. I feel much more energized at work.
I sometimes work before bedtime, and I was worried that the lew light would affect my sleep quality, but I haven't noticed any difference in that respect.
A while ago, I read a blog claiming that most people have their light at home way too dim, but I cannot find it anymore. If anyone has some resources on this topic, I would be grateful for a link.
Edit: Fixed the color temperature values, added some bg info.