Light color or professionally referred to as light temperature measured in Kelvins refers to the color hue emitted by the light bulbs or LED chips of a light fixture. It can be golden yellow (warm) or blueish (cool).
As an interior designer I usually check with the end users before deciding on the color temperature. Some clients prefer warm light and some white light. It is a very subjective thing not unlike tastes in foods. Residential lighting traditionally is warm (yellow/golden) but in the past few years white or cool light has become increasing popular. It is a more modern and edgy look. I find the majority of my customers still prefer warm light and some even hate any white light which appears uncomfortably bright to them. On the other hand some don’t like warm/yellow light at all. So I survey the users first off.
Secondly, I usually try to stick with either warm or cool light throughout a property. Mixing light temperatures tends to look like a mistake and unprofessional.
Personally I like to pick color temperatures based on the color palette and also the function of the room. Cool light in a primarily warm/yellow/gold/earth colored space can give the yellow/warm colors an unhealthy greenish tint. And reversely, yellow light in a room of primarily cool hues such as blues, purples, silver, etc. can appear muddy and dirty. Whereas white or cool light tends look stunning in such a space. However, another consideration is that cool light also tends to be “cool” in terms of mood and come across less friendly than warm light. Somewhat like Elsa in the blockbuster animated Disney movie “Frozen”. She is stunningly pretty as portrayed but has some “cold-hearted” tendencies as a character which is reflected in her primary blue/purple and icy silver color palette. So if I was lighting a space to sell cutting edge Audi’s for example, I’d probably use cool light. If I was lighting a cozy family living room with fireplace and all, I’d probably go for the warm light. Some prefer even their living room to be cool and edgy so again, the user's tastes rank high.