The proposed "halogen" LED lamp replacement module image can be seen below:
The above assembly must be done over a well designed heatsink cored glass epoxy PCB.
The above unit will strictly require a current controlled driver circuit which can be understood with the following points:
We once again take the help of the versatile LM338 IC for the required current control function.
Referring to the circuit diagram we ca see it in it's simplest current limiting mode. The LEDs consume around 2.5 amps together which is never allowed to exceed by the IC keeping the unit safe from the issue.
Aluminum mount or base design for fixing the LED PCB assembly