A power saving welding helmet (1) includes a helmet shell (10) and a lens device (20). The helmet shell includes a mounting hole (11) to contain the lens device. The lens device has an inner surface (201) and an outer surface (202), and includes a magnetic sensor (23), a filter control unit (24), and a filter lens (25). The control logic module (242) controls the filter lens according to magnetic signals generated by the magnetic sensor. The filter lens includes a first LCD panel (251) and a second LCD panel (252) respectively controlled by different control signals. Therefore, a refresh time of the first LCD panel and a refresh time of the second LCD panel do not synchronize. A welder does not feel the first LCD panel or the second LCD panel flashing.
