>>> Less than the electricity to illuminate the building, I would think...
>
>> Depends how big your building is :-) But I find it hard to believe you
>> would use *on average* 500W (or whatever your PC uses flat out) of lighting.
>
> I suppose it depends on the size of the building, but given that
> 100W incandescent light bulbs are (still) popular, even a small building
> is probably using those a lot.

I suppose you could have 20x 100W bulbs burning for 6 hours every day, 
that would add up to an average of 500W.

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