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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.

Like the others reviewed here, the AOC monitor uses a 27-in. IPS panel with a 1920 x 1080 resolution. It features an ultra-fast 2-millisecond (ms) response time, versus 5ms and 8ms for the Philips and Dell displays, respectively.

The all-black casing is broken only by a small blue light in the lower right corner to show it's turned on. On the right side of the monitor's front, there are controls for turning it on and off, raising and lowering the volume, and using the on-screen menu. The marking for each switch's function is embossed in the display's plastic case; classy, but I found the highlighted white markings on the other two displays easier to read.

Saving power

The AOC monitor has two techniques for saving power when it's not being used. First, like the Dell display, it can use the computer's screen saver to trigger its sleep mode. It can also be configured to shut down when the computer is off or goes to sleep. In addition, a timer lets you shut down the screen after a period of inactivity. Unfortunately, the time can be configured in increments of one hour only.

The AOC consumed 27.5 watts when being used, a little more than the Dell display's power profile. Unlike the others, when the AOC screen goes to sleep, it uses no discernible power, compared to 1.1 watts and 2.1 watts for the Dell and Philips displays, respectively. It took 3.1 seconds to wake up.

Assuming it is used for 10 hours every business day and power costs 12 cents per kilowatt-hour (the national average), the AOC should cost an estimated $8.30 to use per year. That makes it the cheapest of the three to use, if only about $2 a year less than the Philips monitor.

How well it worked

At 215 candelas per square meter, the AOC's light output was the lowest of the three; to my eyes, it looked visibly dimmer than the Dell monitor. Its color balance appeared accurate with strong blues and reds. Video play was smooth, with no lags or glitches.

In addition to a standard mode, the display has settings for text, Internet, games, movies and sports. For those who want to tweak the output, the monitor has adjustments for brightness, contrast, gamma and color temperature. Unfortunately, temperature settings are restricted to normal, warm, cool and sRGB settings. You can fiddle with the red, blue and green colors, but I preferred using the Philips's more extensive presets that are based on actual color temperatures.

The monitor also comes with two Windows-only apps. iMenu lets you adjust brightness, contrast and gamma, but lacks the calibration patterns of the Philips display. Interestingly, several of the program's labels are in Chinese characters, making the app hard to fathom without the manual.


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