Q&A – Do black-screen search websites use less power?
A. No. With the world rapidly transitioning to LCD monitors, black-screen pages actually cause these monitors to use more electricity rather than less.
I ran a series of tests with a number of LCD monitors and the overwhelming majority of them used more power to display a black screen than a white screen.
The reason for this is that in order to show black, all of the pixels have to shut off the backlight from coming through – that requires transistors to switch on, twisting the liquid-crystal display pixels to block the light. That requires more electricity.
However, what makes the whole thing a waste of time is the fact that the amount of energy difference between black and white is actually no more than 5%. You can make a far greater difference by dropping the brightness of the screen.
Using a black or white search engine varies power consumption by around one to two watts at most. Dropping the screen brightness of your LCD monitor can drop power consumption by up to 15-watts.
So if you really want to do something for the environment, use Google’s white-page search and drop the screen brightness of your LCD monitor.