Can you show which LED you are using?
I just did a search on Ebay and the first six 10W LEDs I saw had a forward voltage of 9-12V; this is because there are multiple lower power LEDs in the 10W LED assembly, in series and parallel connection. They will get very hot as well - you'll need to heatsink them, and potentially use a fan to help cool the heatsink.
If they have a forward voltage of 9V, then you could use a resistor for each LED to set the current to 1A and then wire the seven LED/resistor sets in parallel to run from the 12V source. This will be wasting 21W in the resistors.
If the forward voltage is higher (e.g. 12V), you may wish to build a boost flyback converter, regulating the current and driving all LEDs in series. This will be more efficient.