Wiring a 12v DC LED

Hey all,

I found this forum while searching for answers as to what I did wrong.. I bought this: LED Underwater Spot Light 10W 12V to add supplemental lighting to my aquarium. I also bought a 12V DC Adapter 2A to wire the light. I've wired DC adapters before for various tasks and never had a problem so I'm a bit perplexed. My first thought was that I needed some other kind of power supply. Maybe you all can help me out, this is what I did:

1. I cut the plug off the adapter and stripped the wires.
2. I twisted the red wire to the black/white wire and the black to black.
3. I soldered both wires and taped them with electrical wire.

Then I plugged it in and got nothing. I unplugged it as quickly as possible thinking I wired it wrong and didn't want to fry anything. So, I then wired it the other way, red to black, black to black/white (going against my instincts here, but thinking it came from China and I don't have a meter, maybe it was just a mistake). Still nothing.

That's why I'm here. Is the LED just broken? I'm thinking about taking it apart and seeing if I can find any lose connections or such inside. Or, was I mistaken in thinking this could be powered by a standard 12v wall plug.

Thanks for any help!
Leo