This is not a good place to start from. LEDs as individuals run at 2 to 4V at a current between ,02 and 4 Amps. Your assembley has some electronics in it that converts 12 to 30V to what ever your LEDs consume., Also the power and current ratings do not make sense as .45 A X 12 V = 5.4 W, should that .6W really be 6 W?
The electronics could be either analogue or switching. The analogue method is to use a transistor to vary the output voltage by changing the voltage drop across its self, so if the REAL output is , say 9V, then with 12V in it drops 3 V and with 32V in it drops 23V. this system looses a lot of power and will require a heat sink.
The switching system, uses a switch to convert the incoming DC to AC and uses a transformer to get the correct output voltage, it is very efficient. It uses a lot more components but does not use a heatsink.
So which system do your LEDs use? or is there none, just a flakey specification.
Have you the tools and experience to construct this kit yourself?
Frank