In this lamp, there are three colour option modes available: warm white, cool day light and golden yellow light. We recommend you to use warm white or golden yellow light mode. LED light with cool day color may not be good for your eyes. Most of the LED lights we see in homes or commercial buildings are of cool day color. This color has more blue light spectrum in comparison to warm white color. Now a days, smart phones has blue color filter features. Learn more about color temperature if you like to understand color comfort.