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I'd also hazard a guess that you'll never notice if it were creating interference: given you'll have local error correction (interference would register as corrupt frames, right, and you'd get retransmission between your computer and your switch/router? it's been a few years), and given that your bandwidth bottleneck is probably whatever your outside internet connection is, which is way way lower than the theoretical max of cat5.
If you test it with a few clamp lights before you go crazy wiring the light, what's the worst that could happen?
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