While all landscape lighting uses white light sources, some of these sources have a warm hue (more yellow), others have a cool hue (more blue). This variation in yellowish or bluish hue is what determines color temperature.
Color temperature is expressed in degrees Kelvin (K). A warm white light might be 2700K – 3000K. A cool white source might be 4000K to 4500K. See the chart below for examples of varying color temperatures.
How do you select landscape lighting color temperature?