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Ask the Editors: Do LCDs save energy?
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Do LCDs save energy?
November 9, 2005
Q
Do LCDs really save much energy over CRTs?
Submitted by:
BethL
via e-mail
Lara Luepke
Lara Luepke
Assistant editor
With energy costs expected to rise, people are looking to save money wherever possible, and though switching from a CRT to an LCD won't save you tons of money, usually around $10 a year, a penny saved is a penny earned. However, if you're considering switching an office full of monitors, the savings could add up quickly.
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For example, if your CRT is eating up 150 watts per hour of energy, and you use the monitor 8 hours a day, 200 days a year, it uses 240 kilowatt hours (kWh) per year. At 7 cents per kWh, your CRT costs $16.80 a year to run.

On the other hand, LCDs typically use only about 50 watts per hour while on. And following the same equation, we find that an LCD costs $5.60 per year to operate, a savings of $11.20.

To find out how much energy your specific monitor uses, look for a label on the back of the monitor, usually near the inputs. If the watts per hour isn't listed there, check the documentation that came with your display. The U.S. Department of Energy's Web site also provides a list of typical wattages for various appliances.



MORE RESOURCES 
Monitor buying guide
Best in class: 19-inch LCD monitors
What to look for in a large LCD


Lara Luepke helps keep your computers well accessorized by reviewing the latest monitors, projectors, and input devices. She also edits newsletters and the Show Us Yours: Home office feature to keep CNET users up-to-date on tech trends.


 
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