The key to driving high power LEDs
The key. Simply, is MOSFETs.
In our current design we have a decent sized MOSFET optically isolated from our control circuitry. This allows us to safely control the 36 volts that our high power LED chips require.
Our original design had been using droking boost convertors on 12V power supplies to bring them up to 36V. After a bit of time working well they tended to become rather flaky. So now we just use a 36v power supply from Alibaba. Power to the LED cooling fans and the microcontroller is provided via the Murata 7812 and 7805 replacement switching power regulators. (Switching regulators are more efficient than linear ones like the 7805)
The fritzing file can be found on the GitHub repo