12V DC LED and motor circuit - overheating
For a 10W LED, if you have 40°C air and can allow a temperature of 60°C on the aluminium star PCB, then you need a 2°C/W heat sink.

Expect a 50mm x 50mm x 20mm block of finned aluminium. 

If you use a fan, then it could be smaller.

The star PCB cannot, obviously, dissipate 10W in free air. It will dissipate one watt, and even that would be pushing it if it's inside an enclosure.

You should also use a switching driver for your LED.

If optics allow, using more LEDs will make your thermal problems simpler by spreading the heat over a larger area. Also, using several LEDs in series will work better with a simple resistor dropper...

Here are examples of heat sinks designed for 3W LEDs.

If this is a personal project, a desktop CPU heat sink/cooler will do nicely. If you have an old junked PC... or have a friend with a cardboard box full of junk PC parts... it's easy to find. It it was designed for a 100W CPU like a Pentium, it will not require the fan to dissipate 10W.