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Flat two core cable thru the window, there is normally enough "give" on the rubber seals to accomodate this with the window closed. Keep the transformer inside so that it is low voltage going to the outside.
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LEDs have such lower power requirements that a small battery pack will do for a couple of hours a day from now until Christmas. Another option is to run a low voltage ribbon cable between the opening and fixed parts of an opening light in a window, there's often enough squish in the seals to accommodate that in modern window units, or enough free clearance somewhere in ancient wooden ones. Don't under any circumstances run mains outside unless protected by a low (10mA) residual current circuit breaker.
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How do I supply power?
http://www.maplin.co.uk/p/50-white-led-solar-fairy-lights-n34hn
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Looks like I'm a little late but lights4fun (who are classier than they sound) have an Outdoor Battery Operated category and the obligatory Christmas category. These look good: http://www.lights4fun.co.uk/i/q/141996-YW/96-warm-white-led-outdoor-battery-fairy-lights-with-timer
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@efb
Er..to get my kids into the Xmas spirit, I'd like a small set of classy, white outdoor lights in our front garden tree. I have no permanent outdoor mains supply nor do I want to drill holes in the house. How do I supply power?