A research paper published over internet by an US based environmental agency Energy End Users Forecasting (http://enduse.lbl.gov/Info/LBNL-48581.pdf) says "Image displayed is primarily a function of the user's color settings and desktop graphics, as well as the color and size of open application windows; a given monitor requires more power to display a white screen than a black screen."
A post published on http://ecoiron.blogspot.com/ says an all white web page uses about 74 watts to display, while an all black page uses only 59 watts. Popular Search Engine like Googe gets around 200 million hits a day. Suppose, on an average, the google home page remains for 10 seconds on a CRT monitor, it consumes 15W (74W – 15 W) more energy than a Black Screened Google would do. This means we can save 8.3 Megawatt-Hour of Energy per day or 3000 Megawatt Hour a year. Using black screen version of search engines like http://www.blackle.com/ can help us saving electricity to a great extent
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