You are correct, the LED strips count as a
FABRICATED ITEM because they were modified. The 2015 Game Manual States:
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FABRICATED ITEMS from ROBOTS entered in previous FIRST competitions may not be used on ROBOTS in the 2015 FRC (other than those allowed per R12-C).
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R12-C states an exception:
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FABRICATED items consisting of one COTS electrical device (e.g. a motor or motor controller), connectors, and any materials used to secure and insulate those connectors.
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The LED strips were COTS when purchased, and they are an electrical item, although I am unsure if this exception covers them. You may wish to take this to Q&A.