I have a 7.5ft tree and ordered two sets in cool white. I used to use warm white, but as soon as they popped up I ripped them off and put them in place. The warm white is too yellow for the look I wanted and they are perfect! I am very happy. If you have a tree like mine I suggest buying two sets, but if you don't need a lot of light you can get away with one. The mode control is also located on the adapter part of the cable. It's the little black button you press to switch modes. Happy Holidays :)
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