RE: Tools: Google promotes energy efficiency

Subject: RE: Tools: Google promotes energy efficiency
From: "McLauchlan, Kevin" <Kevin -dot- McLauchlan -at- safenet-inc -dot- com>
To: "Geoff Hart" <ghart -at- videotron -dot- ca>, "techwr-l List" <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Tue, 10 Jun 2008 14:48:21 -0400

On Behalf Of Geoff Hart said:
> Thought this might be of interest to ecologically conscious folks:
> Basically, it's a "white text on black background" version of Google,
> and nominally works on the philosophy that displaying a black
> background consumes less energy than displaying white. Makes logical
> sense, and there seems to be a literature ciation from a reputable
> source (ironically, black text on a white background <g>) that
> supports this.
> Of course, I've also read that Google has a somewhat checkered
> environmental record because of the huge amounts of power consumed
> and waste heat generated by their computer facilities. But as they
> note, every little bit helps, and they are working on their energy
> consumption problems.

That might work for old-fashioned CRT monitors, of which there are fewer
and fewer being used. On a CRT, the electron beam is _on_ at its
strongest for a white pixel (red green and blue combo) and those
phosphor dots light up, so there's some energy savings for all the dots
that don't need to be "lit".

LCD screens, which are the _vast_ majority of all monitors now sold,
have a constantly-on light-source (usually fluorescent) behind the
screen. The pixels let that light through, or not, to create the picture
that you see.

Showing a mostly-black picture just means that the light is shuttered
(behind all the opaque pixels), but it's still on, full-blast.

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Tools: Google promotes energy efficiency: From: Geoff Hart

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