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LED printers are identical in principle to laser printers except for the light source used. LEDs are more efficient mechanically than normal laser printers, since there are fewer moving parts. Laser systems rely on elaborate combinations of rotating mirrors and lenses that must remain in alignment through use. The laser scans from one end of a line to another, then zig-zags down to the next line. LED technology uses a light-emitting diode printhead as a light source within the imaging device. Unlike laser systems, the LED printhead is solid-state and has no moving parts. The LED bar pulse-flashes across the entire page width and creates the image on the print drum as it moves down. Depending on design, LED printers can have faster rates of print than some laser based designs, and are generally cheaper to manufacture. There are concerns about the LEDs in the printer experiencing early burnout due to repeated on/off switching as a print is made.
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