No flickering is a must when looking for the best lamp. Flickering is a rapid and repeated change in the brightness of a light source over time. Changes and fluctuations in the voltage supply cause the flickering, and the intensity varies depending on the type of lamp, and the ambient light levels.
Constant exposure to flickering lights has a negative impact on the human body. It causes headaches and migraines, eye discomfort, as well as affects focus and productivity. Desk lamps with flicker-free LEDs are intended to solve concerns regarding eye fatigue and other health issues associate with flickering.
Many monitors and some new desk lamps now have Flicker-Free (or ZeroFlicker) technology that delivers the same constant light that is easy on the eyes like a traditional incandescent lamp.