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If you belong to the energy-conscious crowd, you may want to check out the benefits of
Blackle. Using the knowledge that it sometimes takes fewer watts to display an all black page than an all white one on certain types of monitors, Heap Media has created this search engine powered by Google’s Custom Search to appeal to the environmentally aware.
Before you go changing your browser home page to Blackle, make sure to read the fine print. Not every monitor’s power usage benefits from viewing black backgrounds instead of white, and some displays may even utilize more energy in this situation. If you’d like to know how and if using Blackle or any other search engine with a black background can affect your monitor’s energy consumption, see this detailed analysis by Mark Ontkush at ecoIron.
While I like the idea behind Blackle, I’m not really crazy about the interface. I’m not sure if it’s the colors, the font, or the combination of these two things, but looking at the Blackle screen for more than a few minutes gives me a headache. Plus, since I have an LCD monitor, I’m not getting a whole lot of benefit from using a black background.

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Another web search engine that sports a black background is Centralum’s Darkoogle. I don’t have the same eye-strain problems with
Darkoogle as I do with Blackle, so I think my problem with Blackle may have something to do with there not being enough contrast between the text and background colors.
The developers of Darkoogle concede that a black background doesn’t have much impact on the energy consumption of most monitors, but they claim their search engine is more environmentally friendly in another way:
“Our web technology (that relies on AJAX) eliminates the need to reload the whole page when you submit search requests. It reduces bandwidth, server load, and creates a chain of more efficient computing connecting all the way through - starting with your home or work computer and ending in the datacenter of the hosting company. Even if the energy savings are small, they all add up.”