I will be putting together a series of Low Voltage outdoor lights for our house that will probably come close to 600 watts. However, I will only setup approximately 200 watts for the next few months or so before I get around to installing the rest of the low voltage lights. If I get a 600 watt transformer, will I do it any damage by only running 200 watts of lights on it for the short-term, or are my concerns unfounded?

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No, you are fine running a 600-watt transformer on a 200-watt load. 

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