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3 power-sipping monitors lower energy bills

Brian Nadel | Oct. 29, 2014
Can you have a great monitor that also scrimps on electricity -- and helps the environment? We test three 27-in. power-saving displays to find out.

As is the case with the AOC and Philips displays, you can remove the display from the stand and use its VESA mounting holes for use with a third-party stand or mounting hardware. You just need to press a spring-loaded button to release the panel from the stand.

Bottom line

The Dell UltraSharp 27 includes a three-year warranty and it has a list price of $450, considerably more than the AOC's cost. (Note that the cost of the Dell changed several times while this review was being written and edited.) But given that, the Dell provides all the accoutrements needed for doing desktop work without wasting power.

Philips 271S4LPYEB

As minimalist as a monitor gets these days, the Philips 271S4LPYEB is not only power-aware but knows when you're is sitting in front of it and can automatically go to sleep when you're not. Too bad it lacks creature comforts like a webcam, speakers or even an HDMI port.

The all-black display houses a 1920 x 1080 IPS panel that is rated at 5ms response time.

Saving power

Perhaps the most interesting feature is pair of infrared sensors that perceive whether someone is sitting in front of the screen. Called PowerSensor, the system can be set to four different distances (user to screen) between 12 in. and 40 in. It's quite an impressive trick. One minute after the space in front of the display is vacated, the image dims; two minutes later, the screen goes black. Then, like magic, the screen lights back up when you sit in front of it. When I tried it, the screen came back to life in less than a second.

After some fiddling (to figure out which distance setting was best for me), I found it worked well and quickly responded to my absence and return. I was able to fool it, though, by leaving my desk chair with its back to the screen.

The Philips used 28.8 watts of power in Office mode, which was similar to the standard modes of the other two displays (however, power use varied only slightly with the other modes). When the PowerSensor kicked in, the power demand was initially reduced to 10.6 watts for one minute and then to 2.1 watts.

Ironically, though, the Philips turned out to be the highest power user of the three -- probably because of the overhead required to keep the PowerSensor active and ready to restart the display. All told, using my assumptions that it was used for 10 hours a day for every business day and that electricity costs 12 cents per kilowatt-hour, the display had an estimated annual operating expenses of $10.20.


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