They don't give a lot of information on voltage and amperage requirements... it IS low voltage (~2V DC for each LED) but how are the LEDs wired? If it's in series, and I count 18 per tube... that'd be 18VDC - 54VDC depending on the LED... you could probably get away with it... but CAT5 is what, about 24 ga... I just wouldn't do it.

Bren R.