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Old 07-27-2007, 11:18 AM   #1
Cornellius
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Default Blackle

http://www.blackle.com/

How is Blackle saving energy?

Blackle was created by Heap Media to remind us all of the need to take small steps in our everyday lives to save 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.

We believe that there is value in the concept because even if the energy savings are small, they all add up. Secondly we feel that seeing Blackle every time we load our web browser reminds us that we need to keep taking small steps to save energy.


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Old 07-27-2007, 06:14 PM   #2
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Default Re: Blackle

This is absolutely stupid. Most people have LCD screens nowadays. It takes MORE energy to blacken the pixel. A completely white screen is just the lamp allowed to shine through. A completely black screen requires it to darken all the pixels to block the lamp.

FAIL.
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Old 07-28-2007, 12:31 AM   #3
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Default Re: Blackle

> This is absolutely stupid. Most people have LCD screens
> nowadays. It takes MORE energy to blacken the pixel. A
> completely white screen is just the lamp allowed to shine
> through. A completely black screen requires it to darken
> all the pixels to block the lamp.

I saw this story on Slashdot and that was noted numerous times. I still think it's easier to look at a dark screen with light text myself though. My KDE colour scheme uses lots of dark grey with some green highlights, and my website uses a totally black background.
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Old 07-28-2007, 02:18 AM   #4
SwampGas
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Default Re: Blackle

> I saw this story on Slashdot and that was noted numerous
> times. I still think it's easier to look at a dark screen
> with light text myself though. My KDE colour scheme uses
> lots of dark grey with some green highlights, and my website
> uses a totally black background.

I guess zd was environmentally friendly back in the CRT days but we're heathens in the LCD days.
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Old 07-28-2007, 03:16 AM   #5
Cornellius
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Default Re: Blackle

> This is absolutely stupid. Most people have LCD screens
> nowadays. It takes MORE energy to blacken the pixel. A
> completely white screen is just the lamp allowed to shine
> through. A completely black screen requires it to darken
> all the pixels to block the lamp.

Errr, quite the contrary. LCDs works with tempurature in kelvins. The higher the temperature, brighter the white will be. On my LCD moniter, I can set it to sRGB, 6500 Kelvins and 9300 Kelvins. The darker the color is, the less temperature is used by the pixel. The brighter the color is, more temperature will be needed. The higher the temperature, more power will be needed.


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Old 07-28-2007, 03:39 AM   #6
SwampGas
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Default Re: Blackle

> Errr, quite the contrary. LCDs works with tempurature in
> kelvins. The higher the temperature, brighter the white
> will be.

That's the temperature of the element in the lamp. The lower the temp, the more yellow it becomes. CFL lightbulbs, HID headlights, etc are all measured like that...my car has 4300k lamps and the bright white CFL bulbs I use on the walkway are 6500k. We're talking about the actual LCD screen.

The lamp is on at the same brightness no matter what is on the screen.
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Old 07-29-2007, 01:58 AM   #7
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Default Re: Blackle

> I guess zd was environmentally friendly back in the CRT days
> but we're heathens in the LCD days.

Ah now, but see...you were ahead of the curve man. <img src=smilies/magbiggrin.gif>
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