Colour temperature is measured in Kelvin. Lower numbers (2200 to 3000K) give a warm, amber light; higher numbers (4000K and above) feel cooler and bluer.
Homes generally feel best with warm light in living and sleeping spaces, and neutral light (around 3000 to 3500K) where tasks need clarity, such as kitchens and bathrooms.
Keep colour temperature consistent within a room. Mixing warm and cool bulbs is one of the most common reasons a space feels slightly ‘off’.