Check out this detailed test http://techlogg.com/content/view/360/31/
There’s no argument that on CRT monitors, Blackle does reduce the power consumption but it’s not by the 15-watts claimed. We tested the four CRT monitors we could get our hands on and found that only one unit, an older 22-inch Compaq, showed the 15-watts or more power differential.
But with the LCD monitor market penetration worldwide now beyond 75%, it’s the LCD monitor power consumption that’s just as, if not more, important.
The most interesting aspect we found was that of the LCD monitors we tested of size 22-inches or less, all showed an increase in power consumption using Blackle. Beyond the 22-inch mark however, five of the six models showed a fractional decrease in power consumption when using Blackle, except the ViewSonic VX2835wm, which showed a 2.2-watt increase.
For the five that dropped their power consumption, the average drop was 3.16-watts, again, not the 15-watts being suggested.
Just because you heard it on breakfast TV doesn't mean it's true!
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