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Laser printers use more power, though. Still, I'm not sure which has the lowest cost of operation once you factor in the cartridges.
In a 'low usage', what matters most is the lifetime of the printer itself: I had my laser printer for 10 years and I didn't have to replace the cartdrige yet.
In the same time, my brother had to buy two inkjet printers because the first one failed after a few years, plus several ink cartdrige because they failed too (not enough usage).