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Those are great for both indoors and outdoors and can be used any time of the year, they give a lovely warm glow, and they are energy-saving the lights is 4.5V, mind you the batteries are not included, and the color temperature is 3000K.
They are waterproof and different from solar lamps, they need batteries.
If you are in the season's spirit and want to add to the daylight, then put those lovely colors around you, they are easy to put up and they come with remote control for brightness and a timer.
They give a steady glow due to the batteries which power them.