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Generally that is how it is doneIs it acceptable to solder connection wiring to led star pcb after being torqued to heatsink with thermal paste? I am planning to try one to see how hot the heatsink gets from the solder process.
To attach the LEDs to the heatsink, use the Arctic Alumina heatsink epoxy. As the packaging states, the bond is PERMANENT so make sure you have the LEDs aligned before attaching them. It’s best to save the wiring job until the LEDs are mounted and the epoxy has cured.