Our winter are long and dark. The more drastic change in daylight between seasons can cause all sorts of health issues, especially during the dark times. With less sunlight we get less vitamin D for example. The changes in the level of light can also mess up with our circadian rhythm.
Back in the old days there wasn't much that could have been done about it. Sure the light helps, but the light available was usually either fire or later incandescent lightbulbs, both producing mostly the warmer colours of light. The light that we mostly relate to the dusk and sets our pineal glands ready to be prepared for the night mode i.e starting to produce melatonin.
Luckily these days we have LED lights available. Among other things they can produce light more closely representing daylight. Such lighting should be much better helping us to get us keeping our pineal glands in check and not trying to put us to sleep way too early.
The colour temperature of the light alone isn't enough however. The light needs to be bright enough as well. There are actually special bright light lamps available exactly for this purpose. Those often have the light output of over 10000 lumens (usual lighting is commonly around hundreds of lumens) but anything above 2500 lumens should already be able to produce desired results.