Blackle is a website powered by Google Custom Search, which aims to save energy by displaying a black background and using grayish-white font color for search results. Blackle has claimed to have saved over 2,000,000 watt hours. This claim is under dispute a lot.[2].
The concept behind Blackle is that computer monitors can be made to consume less energy by displaying much darker colors. Blackle is based on a study which tested a variety of CRT and LCD monitors. There is dispute over whether there really are any energy saving effects.[3][4][5]
This concept was first brought to the attention of Efap Media by a blog post, which estimated that Google could save 750 megawatt hours a year by utilizing it for CRT screens.[1][6] The homepage of Blackle provides a count of the number of watt hours claimed to have been saved by enabling this concept.The concept behind Blackle is that computer monitors can be made to consume less energy by displaying much darker colors. Blackle is based on a study which tested a variety of CRT and LCD monitors. There is dispute over whether there really are any energy saving effects.[3][4][5]
No evidence exists to support the idea that black screens on modern LCD displays use less power than white screens. Google has admitted that the opposite may be true for LCD screens where black uses more energy than white[7]. Despite of that opinion the german physicist Oanh Hoang claimed the idea that a light "behind" the screen may expends less energy.
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