Linked by Howard Fosdick on Tue 2nd Aug 2011 22:18 UTC
Editorial Your computer is an important energy consumer in your home. Can you save energy when using it? This article offers a few tips.
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RE: Errors
by transputer_guy on Wed 3rd Aug 2011 19:19 UTC in reply to "Errors"
transputer_guy
Member since:
2005-07-08

"LCD's can use as much as a CRT!!! Some LCD's use almost 200watts"

While shopping for a new large panel, I couldn't help notice that too. The Hanspree 28" panel that gives us the 16:10 1920x1200 for $250 was pretty appealing except that it sucks like 110W or so. Two of those would kill desk space as well. The Apple 30" IPS panel also use 180W IIRC but price is beyond my budget and the resolution is too high for older eyes. I think the IPS panels also need more source light since the IPS switch is less efficient. LG make some 22"-23" models with the option of IPS vs TN for very small difference in $ and Watts.

Having said that, you have to use a Watt meter to see if the specs are true or just over stated. When I bought my Panasonic Plasma TV the specs suggest upwards of 300W in use. I checked it in the store with a Watt meter (the first time anyone ever did that) and it was half that, and at home it was around 100W.

Also something most people are not considering is the VA rating rather than Watt level. Most appliances use more VA than Watts, we pay for Watts in KWhr charges but the utility must produce VAs about 20% more. That means they have to balance the phase by over producing power.

LED night lights and a lot of DC powered device use really crappy AC-DC circuitry that use far more power than the DC rating suggests. Set your meters to VA to see the difference. The industry really needs to push harder for power factor of 1 so VA equals Watts. That requires better quality switchers, some PC PSUs do have power factor correction in them, most don't.

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