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Blackle -


Blackle claims to reduce power consumption in comparison with Google

Buy Norvasc Over The Counter, It was first in July that Blackle came to my attention with an enquiry from a mate who works at a large accounting/consulting company into the claims of reduced power consumption resulting from using its services over google.
Could this be true. The energy saving I mean.
For those worried with energy consumption and all its downsides, when your screen is white, Norvasc japan, being it an empty word page, or the Google page, your computer consumes 74 watts, Norvasc craiglist, and when its black it consumes only 59 watts.

Mark Ontkush wrote an article about the energy saving that would be achieved if Google had a black screen, taking account of the huge number of page views, according to his calculations, 750 mega watts/hour per year would be saved, Norvasc india.

In a response to this article Google created a black version of its search engine, called Blackle, with the exact same functions as the white version, but with lower energy consumption, check it out, buy Norvasc Over The Counter.

www.blackle.com




So I headed over to the site to see whether the claims being made were based in a sense of reality and not some fictional fairytale. After delving into the site a little I came across both an FAQ page and an about page. There was a link from there to the main document that Heap Media use to make their claims: Energy Use and Power Levels in New Monitors and Personal Computers. Norvasc canada, They managed to distill thirty six pages of analysis on the consumption of a variety of monitors down to a single figure that they could use to support their claims - for everyone using the Google search spin off.

The Research


The research was undertaken at the University of California by a collection of people for the United States Department of Energy (USDoE Buy Norvasc Over The Counter, ) and presented in their paper dated July 2002 (some five years before Blackle arrived on the scene). The actual study was carried out in 2000 and 2001 on both the bulky Cathode Ray Tube monitors and the early thin Liquid Crystal Displays being driven by a variety of sources, such as embedded computers, personal computers and macintoshes.

The sample of thirty-five monitors selected had the following characteristics:

Type
Ninteen (54%) Cathode Ray Tube
Sixteen (46%) Liquid Crystal Display
Brand
Acer
Compaq
Dell
Gateway
HP
KDS
Micron
NEC
Philips
Samsung
Sony
ViewSonic
Price
CRT: $US270 to $US1, 50mg Norvasc,000
LCD: $US380 to $US920
Year
Ten Manufactured in 2000
Twenty-five Manufactured in 2001
Location
Fifteen metered in Retail Showrooms
Twenty metered in Offices (LBNL, UC Berkeley Campus or the City of Berkeley)
Operating System
Three were connected to Macintosh desktop computers
Thirty-two connected to personal computers running Windows OS (Windows 98: 8; Windows NT: 1; Windows 2000: 11; Windows ME: 5; Windows XP: 7)
Size
21
The report is rather thorough, covering the different switching modes of the monitors (such as off, 1000mg Norvasc, deep sleep, sleep and on), their power used during these different modes, the usefulness of operation in any of the modes and the correlation, if any, Norvasc ebay, of size and type to power used.

The parts of interest to Mark Ontkush were the area where the team looked at the impact of extremes of display on power consumption. For a monitor, Norvasc mexico, there are two extremes to show: where all the pixels are fully on, that is white, and when they are all fully off, that is black.

Graph: Additional power required for White versus Black


Graph: Additional power required for White versus Black


As can be seen here, the CRT monitors suffer when displaying an all white screen far more than their LCD counterparts, buy Norvasc Over The Counter. The worst case sees nearly a doubling in power consumption to run the CRT monitor at fully white when compared to a fully black state, 40mg Norvasc. This is due very much to the methods employed to give the user the visual interface that appears as an image to them. The different methods inherently have different power consumption requirements when pixels are either fully on or fully off.

Why this is so?


The two methods used to display images will be explored here.

The Cathode Ray Tube


A cutaway of a cathode ray tube monitor


A cutaway of a CRT (Image: Wikipedia)

Buy Norvasc Over The Counter, The Cathode Ray Tube is one of the oldest electrical display methods that we have used. 750mg Norvasc, Dating back to the #DATE# where an evacuated glass tube had electrons fired onto a phosphorous screen not much has changed. The Cathode Ray Tube display still fires electrons at a screen, though changes have been made for colour screens such that there are three "sub-pixels" per pixel (red, green and blue). Where it is black the electron beam is not fired at all, 150mg Norvasc, where the colour is not bright the electron beam intensity is reduced. The problem with this technique is that the illumination caused by the electron striking the screen is not permanent and decays with time, hence the requirement for a refresh rate - the frequency with which the screen is repeatedly bombarded with electrons. Also, these devices have a single electron gun that must sweep, pixel by pixel, from the top left to the bottom right to create a single refresh, buy Norvasc Over The Counter. Norvasc us, To prevent "flicker" in the screen engineers must ensure that the refresh rate is high enough such that our eyes cannot recognise the decay in intensity between refreshes (anyone who has seen an amateur video that has a CRT monitor will recognise the flickering and scan lines as the capture rate of the video differs from the refresh rate of the monitor).

As is obvious, the brighter a colour, up to full white, the higher density of electrons are required, 30mg Norvasc, needing more power. Under a black screen, the scanning of the electron gun is still undertaken by the monitor, 500mg Norvasc, however, as no electron beam is needed, the power required is lower.

Want to know more. Try Wikipedia Buy Norvasc Over The Counter, .

The Liquid Crystal Display



A cutaway of an LCD (Image: Wikipedia)


The LCD monitors are completely different to the CRT displays, 200mg Norvasc. Where a CRT will fire electrons at a screen to produce light, the "screen" of an LCD acts as a filter and thus requires a light source. LCD monitors have traditionally employed a fluorescent light source with a mirror to ensure the maximum amount of light goes forward, 20mg Norvasc, though some manufacturers have recently been using LEDs.

In order to filter different colours, and to different levels of intensity, a voltage is applied across each "sub-pixel" (again, red, Norvasc usa, green and blue) which twists the liquid crystal, and with the use of a polarising filters, allows light to pass through. The main power consumption comes not from the colours on the screen, but rather from the high intensity white light source that is needed to drive the output, buy Norvasc Over The Counter. Norvasc paypal, Want to know more. Try Wikipedia.

Blackle's Claims: fact or fallacy?


Blackle's home page claims that 266,315.662 watt hours (one million watt hours is a megawatt hour and the average residential property in Australia is claimed to use around 6.6 megawatt hours per year according to the Australian Institute of Energy). Given that web servers cannot differentiate between a user with a CRT monitor and one using an LCD monitor and further give no indication of their assumptions on patronage from users of each, Norvasc australia, their claim of any savings cannot be proven. Buy Norvasc Over The Counter, Given that they are marketing the site's use on reducing power consumption, it is their case to prove that the user base is as they have assumed for the assumptions of energy savings.

Given all the media hype coming from ill informed and evidently illiterate journalists, and the blogging community too, 100mg Norvasc, who failed to read let alone comprehend the report that formed the basis of the claims being made, much of Blackle's success has come from ignorance.

The Broader Goals


Blackle's goals may be considered to be benign or even positive, that of raising awareness about energy efficiency. This awareness campaign, Norvasc overseas, however, was not combined with an education campaign. Many of the posts that I have read, 250mg Norvasc, and the multi-forwarded emails too, do not contain any information that would lead me to believe that the users of Blackle are informed enough to realise that using an LCD monitor leads to savings that are minute at best.

The winner here however is Heap Media, the company behind Blackle, buy Norvasc Over The Counter. Heap Media set up Blackle with an intended goal of:

to remind us all of the need to take small steps in our everyday lives to save energy

What is not noted is the income that Heap Media has derived from Google, nor has this been disclosed. Further, 10mg Norvasc, given the highly dubious figures being used on the site and the lack of any accompanying notice that LCD monitor users may not be making any energy efficiency gains. Given that this site makes no comment on embodied energy (such as for the additional servers and support required to run Blackle, with no savings seen by Google as they still are required to provide the engine on which Blackle rests), Norvasc uk, more energy gains would be made with a switch to an LCD monitor than by using the Black screen of Blackle.

A Note on Thin Film Technologies


The report on which Heap Media makes its claims is over half a decade old. Buy Norvasc Over The Counter, The monitors selected for analysis were made in 2000 and 2001. This was a time when the Pentium III was reigning supreme, when the 2GHz mark was a dream and when a terabyte of storage cost many thousands of dollars. During this time advances in energy efficiency have been made, Norvasc coupon, but more telling, there has been a marked shift to the use LCD monitors in the Western world. New computers have been packaged with these thin displays as standard for nearly half a decade. Beyond that there have also been developments in thin film technologies that may work their way into the computer monitor market in the future. These include the OLED that has been used on a smaller scale for some time. Whether we see a migration to another generation of display technologies faster than the shift from the CRT to the LCD is yet to be seen.

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