Energy-saving search?

I offer this for what it's worth. 

There's a new search site called Blackle.com.  The page is black and grey, and its creators say the darkness saves energy:

Blackle saves energy because the screen is predominantly black. "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 (or light) screen than a black (or dark) screen." Roberson et al, 2002

In January 2007 a blog post titled 'Black Google Would Save 750 Megawatt-hours a Year' proposed the theory that a black version of the Google search engine would save a fair bit of energy due to the popularity of the search engine. Since then there has been skepticism about the significance of the energy savings that can be achieved and the cost in terms of readability of black web pages.

I tried it.  I can attest to the concerns about readability y of dark Web pages.  My eyes hurt.