Save Electricity by using black – Black Google Would Save 750 Megawatt-hours a Year
Here’s an interesting article I found from ecoIron
Take at look at Google, who gets about 200 million queries a day. Let’s assume each query is displayed for about 10 seconds; that means Google is running for about 550,000 hours every day on some desktop. Assuming that users run Google in full screen mode, the shift to a black background [on a CRT monitor! mjo] will save a total of 15 (74-59) watts. That turns into a global savings of 8.3 Megawatt-hours per day, or about 3000 Megawatt-hours a year. Now take into account that about 25 percent of the monitors in the world are CRTs, and at 10 cents a kilowatt-hour, that’s $75,000, a goodly amount of energy and dollars for changing a few color codes.
You’ll find a lot of pages out there that claim “many studies have shown … that dark text on light background is easier to read”. I have always suspected that this is due to the historical accident that physical writing works best with dark ink on light paper-ish stuff. I wonder how many of “those studies” studied populations that grew up unbiased — i.e., grew up and learned to read without the historical accident of paper-based (dark on light) reading.
Only CRT displays use more energy to display brighter things. For everything else, it is completely false that a black display uses less energy than a white page. The backlight on an LCD is on for the entire LCD regardless of what is being shown. The black pixels are only black because the LCD blocks out light. Same with projectors, etc. You’re article is thoughtful, but invalid.
Something to consider: If Google were to change the color scheme to all black, Google would loose AT LEAST 50% of its user base (dare I say 80%?). The “tech Elite” could find work arounds such as using Firefox extensions (Stylish or Greasemonkey), but the vast majority would just switch REGARDLESS of the fact that functionality remained the same.
All the money Google would be saving people (assuming the accuracy of this article) would be guzzled in the end by Google’s competition: Yahoo And Microsoft have lots of white on their search pages.
Fact is, this entire idea of Google saving energy by switching to “black” would lose GOOGLE money, and not be much better energy wise at then end. Not only will it never happened, but even if it did no good would come of it (for anyone).