There's a big difference between cold light a neutral light. Personally I hate "warm" bulbs. I use the "natural" bulbs which to me appear not cool but neutral. I've read that asian nations also tend to use much cooler bulbs and dislike the warm ones, but I can't find the reference now.

Also, according to your Wikipedia article "Lighting levels that affect the circadian rhythm in humans are higher than the levels usually used in artificial lighting in homes".

So you use a varying color temperature and brightness throughout the day/night cycle.