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Originally Posted by Daggerpie
Thanks for the link, they sound perfect apart from throwing up the dreaded fault light. Any pointers to ones with the built in resistors??
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I don't think it's possible to make them in 1156 form factor - the 15W resistors would probably be bigger than the bulb itself.
The trouble with high output LED/SMDs is that even though they use less electricity, they get very hot with conductive heat, whereas traditional bulbs do use more electricity and are less efficient, but most of the heat is wasted as infra-red heat which is harmlessly radiated into the surroundings. That's why you will never see an LED-powered rotisserie.
The SMDs are already at their thermal design limits without the additional heat of resistors.
The new A8 LED headlamps have complex air-ducts, heat-sinks and fans inside because of the heat buildup in the high power LEDs.
The wasted heat of a halogen bulb shines out, but unhealthily builds up in the substrate in an LED.