The monitor accounts for about half the energy use of a typical computer setup. Large monitors use more energy than small ones--a 17-inch color monitor uses about 35% more energy than a 14-inch color monitor. Color monitors use up to twice as much energy as monochrome ones. And high-resolution monitors use more energy than low-resolution models. Most monitors use cathode ray tube (CRT) technology. But many laptop computers have liquid crystal displays (LCDs). Color LCD monitors use only 10% to 20% as much power per square inch as color CRT monitors.
Like computers, ENERGY STAR® monitors have a sleep feature that powers them down (to 30 watts or less) after a period of inactivity. You can also cut your monitor's energy use by turning it off whenever you aren't actively using it. Even if you hesitate to turn off your computer for half an hour because you don't want to wait for it to start up again, you can still turn off the monitor.
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