65/66 Dart Tail Lamp Bulb?

BillGrissom said

Any LED lamp is a bad idea?

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That's correct, for reasons that have been gone over a whole lotta times.

BillGrissom said

Even if an 1156 is judged "too bright" and some LED versions aren't as bright?

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Yup, even if. It's not a simple matter of brighter/dimmer, it's that "LED bulbs" do not allow the lamp to distribute the light (whether there's the right amount, too much, or not enough of it) in an appropriate pattern.