3 whole Watts at 12V through 12 leds as 4 chains of 3 leds with a resistor, getting about 20mA each all on a 30mm disk didn't get warm in the short periods I lit it up.
It sheds enough heat that insulating parts, even the back, quickly raises the temperature. They need to be mounted with good air flow and a heat sink of some kind wouldn't hurt but isn't necessary and could serve as a bracket.
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