Christmas light stringing LED's/ electrical ???

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Posts: 4,907
edited December 2013 in The Clubhouse
OK...so we bought some of the C9 size LED X-mas lights that say you can string up to 25 identical sets together but after the 2nd set they start to get dimmer with some out completely. Any ideas?
EDIT" I should add that if I take the 'dimmed' string of lights out of the circuit and plug each string into it's own power source they work fine. So, 2 sets together work nice and bright. The 3rd and 4th string work fine individually, but when I string 3 or 4 sets together the 3rd set is dim and the 4th set is a combination of dim and completely non-working bulbs.
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