If the new LED's are the same voltage as the ones you're replacing then it's just a case of swapping them over. If they are different voltages then you'll probably have to add resistors into the circuit.
Ok, but how do I know what the values are for the ones I have in the system at present (come to think of it the ones I have in the bag don't have values on them either


Did my dual loop build back in mid september and my rooms still got odd cable ties and bits of tubing lying around, seriously need to have some sort of clean up