What color temperature is best for a desk monitor light?

For daytime productivity, 4000 5000K (neutral to cool white) promotes alertness and reduces drowsiness. For evening use, switch to 2700 3000K (warm white) to minimize blue light exposure that can disrupt sleep. The best monitor light bars offer adjustable color temperature so you can shift from cool during the day to warm at night. Auto dimming models adjust both brightness and temperature automatically based on ambient light.