The star acts as a heat sink so you don't need any additional heat sink. They do get warm, not quite finger burning warm but close to pain warm.
I would give them a try with 4 stars at 13.2V. You may want to pay a bit more for the 3W version. I have not tried them yet but will soon when the next shipment gets in from Futurelec. I am hoping that 3 - 3W warm whites will be equivalent to a 100W incandescent bulb.
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