From: Charles Martin <[EMAIL PROTECTED]>
--------------------------------------------------Subject: Re: Sleep Date: Mon, 6 Sep 2004 17:08:33 -0400
There are three reasons why Apple has said that sleeping the machine is preferable to shutting it down every time you finish using it.
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The second reason is a mechanical one, and I'll be the first to admit I have NO first-hand confirmation of this. The theory is often referred to as the "pilot light" theory, meaning that if the Mac continues to draw a bit of power through it (as it would while sleeping) then the components responsible for "starting up" the machine are slightly more warm and therefore don't get as big a "shock" as they would from a "cold start." Specifically, this theory says that the monitor portion of the computer specifically benefits from sleeping over "cold starts," though I imagine the benefit might extend to other parts as well. It's just a pet theory and makes sense to me, but feel free to poo-poo the whole concept.
It has basis in the days of vacuum tubes. It has to do with the Tungsten filaments used in the CRT type monitors. Tungsten has a positive temperature coefficient of resistance; the cold resistance being about a third of that at the operating temperature. So when you turn on a CRT from cold, three times the current flows through the filament until it heats up. The theory is: Multiple turn-ons stress the filament and it can fail earlier than when it is allowed to run hot (or reasonably warm) when not in use. (You may have noticed how incandescent lamps sometimes burn-out at the time they are switched on) There are ways to limit the initial inrush current to avoid this kind of damage. With proper attention to design, this should not be an issue with modern CRT based equipment. Nor should it have anything to do with the LCD type monitors.
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