I've just fitted a set of these in my t5 and all working fine. The lamps are 12v so throw away the power supply it comes with.
Couple of things to bare in mind though;
1- use a 12v regulator as LEDs a sensitive to voltage fluctuation
2- LEDs a polarity sensitive so make sure you know which is the live core and which is the neutral (it won't damage them if you get it wrong it just wont work)
3- some say wire LEDs in series but with the decking lights I fitted that didn't work so had to wire them in parallel, I would think it would be the same for you.