What is the difference between LED desk lamps and traditional desk lamps? Which one is more eye-friendly?

LED lamps work on DC, so there is no flicker.

Ordinary desk lamps also depend on what form, ordinary light bulbs, old-fashioned fluorescent lamp type, there is flickering. If it's an energy saving lamp type, you won't see flickering either because it works at a high frequency internally.

From eye protection, in addition to flicker, illumination to be considered, but also about the color of light, spectrum, some lights have a narrower spectrum (cheap energy-saving lamps, fluorescent lamps, LED lamps are also good and bad), some of the colors in the light will be discolored, or the color is not pure, which is also harmful. In addition, people's preference for light color should also be noted, some like warm light type (yellow-white) some like cold light type (cold white), it is best to consult the user's opinion, long-term work under the light color that you do not like, but also affects the mood and eyesight (eye fatigue easily).