I posted about this somewhere on here last year. I tested LED lights and an outside timer against just LED lights with my kill-a-watt. It turned out that leaving the lights on all night and unplugging them in the morning used less electricity than using the timer. IIRC, the lights used 7 watts and the timer used 5 watts.
Which brings to mind an interesting question. How much energy does a kill-a-watt use?
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