What is the power consumption of an iMac in sleep mode?

Like most people, I let my iMac "sleep" overnight with all sorts of things set up on it. I want to buy a UPS to make sure that even if the power is interrupted, it will stay on in sleep mode.
So, my questions are:
How much power (watts) does a 20" Core Duo iMac w/2GB memory use in sleep mode?
How much battery power do I need to buy? (I'm not an engineer; I don't know if, say, 400 watts for 60 minutes would let me use 10 watts for 2400 minutes, etc.)
Thanks!
iMac Core Duo Mac OS X (10.4.4)

I also found this page, which suggests that the Core Duo processor has cool (ha) features:
"the Core Duo processor introduces new integrated per-core digital temperature sensors and advanced thermal management. One advantage of this is that if a sensor shows that one core is running hot, the thermal system will automatically lower the frequency and voltage to both cores to cool the whole chip off."
Supposedly, the Core Duo also has Enhanced Deeper Sleep (yikes) which can take processor power usage down to an amazing 1.8 watts. I don't even know if an off-the-shelf iMac can make use of EDS, which must be enabled in the BIOS of the computer.
However, I still don't have the answer to my question - How much power (watts) does a 20" Core Duo iMac w/2GB memory use in sleep mode?
iMac Core Duo Mac OS X (10.4.4)

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