[fyeg_gen-l] Black screen doesn't really save energy
brunonicostrate at yahoo.fr
Wed Dec 5 19:43:49 CET 2007
Just to inform you that black screen doesn't decrease consumption of
Google wanted to be clever by setting up its search engine in black
(http://www.blackle.com), but it appears they are wrong:
We’ve boosted our testing to now include 27 monitors so we’re no pretty
certain we know what to expect after our final series of tests.
Our tests on Blackle versus Google
<http://techlogg.com/content/view/341/31/> has been reported on by major
newspapers and sites around the world. Well, while a few people have
managed to pull out a monitor or two to test how much power they consume
running the two search sites, we think we’ll have to last word.
Yep, we’ve tested 27 monitors, including some 23 LCD monitors, to find
out once and for all how both of these search engines stack up on
monitor power consumption.
We’ve taken a range of sizes and brands to try and get the most reliable
test results possible.
There’s no argument that on CRT monitors, Blackle does reduce the power
consumption but it’s not by the 15-watts claimed. We tested the four CRT
monitors we could get our hands on and found that only one unit, an
older 22-inch Compaq, showed the 15-watts or more power differential.
But with the LCD monitor market penetration worldwide now beyond 75%,
it’s the LCD monitor power consumption that’s just as, if not more,
The most interesting aspect we found was that of the LCD monitors we
tested of size 22-inches or less, all showed an increase in power
consumption using Blackle. Beyond the 22-inch mark however, five of the
six models showed a fractional decrease in power consumption when using
Blackle, except the ViewSonic VX2835wm, which showed a 2.2-watt increase.
For the five that dropped their power consumption, the average drop was
3.16-watts, again, not the 15-watts being suggested.
But for the sake of fairness, here’s what we suggest – if you’re using a
CRT monitor, you can save some power by using Blackle however it won’t
be as much as its supporters will have you believe. We still think it’s
If you’re using a 22-inch or smaller LCD screen, stick with Google if
you want to keep power consumption to a minimum. However, if you have a
24-inch or larger LCD monitor, on average, Blackle is the cheaper option
but it’s not a guarantee – as we said, we found one 28-inch LCD monitor
that bucked that trend.
However, the power consumption difference between Google and Blackle on
all 23 LCD monitors was as small as you could get – an increase of 100mW
(0.1Watts). So after all that testing, we’re in a better position to say
that anyone else that Blackle makes next to no difference, on average,
with LCD monitors.
If you’re really serious about saving energy, here’s just a couple of
tips that will make far more difference: switch off your computer at the
end of the day and don’t bother with a screensaver, because every
screensaver costs power to run.
/*UPDATE August 10, 2007 - *If you're serious about wanting to save
power with your computer, read this story.
<http://techlogg.com/content/view/367/> We've outlined five simple ways
based on our tests that we can all use to help save amounts of energy
that far exceed what you can do with a search engine. /
/*Darren Yates is a B.Sc. (electronics) graduate of Macquarie
University, Sydney, Australia. */
(inch)* *Resolution (pixels)* *Google
(watts)* *Power difference (watts)*
LG SW570LE 15 1024x768 26.2 26.5 -0.3
AOC LM721 17 1280x1024 33.1 33.5 -0.4
Acer AL1916W 19 1440x900 28.3 28.8 -0.5
BenQ FP93G 19 1280x1024 31.1 31.9 -0.8
LG L1917S 19 1440x900 33.3 33.4 -0.1
LG L192WS 19 1440x900 24.5 25.1 -0.6
LG L196W 19 1440x900 38.6 39.7 -1.1
ViewSonic VX1932wm 19 1440x900 35.5 36 -0.5
Asus VW202 20 1680x1050 35.7 37.2 -1.5
BenQ FP202W 20 1680x1050 43.6 44.3 -0.7
Acer AL2216W 22 1680x1050 30.5 32 -1.5
Asus PG221 22 1680x1050 54.9 55.9 -1
Asus VW222 22 1680x1050 43.2 43.4 -0.2
BenQ FP222W 22 1680x1050 40.7 41.9 -1.2
LG L226W 22 1680x1050 39.9 42 -2.1
Samsung 226BW 22 1680x1050 43.6 44.8 -1.2
ViewSonic VX2255wmh 22 1680x1050 41.3 42.4 -1.1
BenQ FP241W 24 1920x1200 87.4 85.2 2.2
Dell 2407WFP-HC 24 1920x1200 82.7 81.3 1.4
NEC LCD2490WUXi 24 1920x1200 73.7 69.6 4.1
NEC LCD2690WUXi 26 1920x1200 89.3 85.2 4.1
ViewSonic VX2835wm 28 1920x1200 106.8 109 -2.2
Samsung 305T 30 2560x1600 111.5 107.5 4
* *51.1* *51.2* *-0.1*
*CRT models* *
Acer AC915 19 1280x1024 75.9 64.6 11.3
Compaq P1210 22 1280x960 112.6 96.2 16.4
Digital PCXBV-HY 15 1024x768 73.6 65.1 8.5
Mitsubishi DV1770 17 1024x768 72.5 65.4 7.1
* *83.7* *72.8* *10.8*
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