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I find it weird to make LED bulbs backwardly compatible with incandscent bulbs. Incandescent bulbs use (US standard) 120 volts ac and LEDs run on low voltage DC. The LED bulb form factor includes a power converter, LED driver, heat sinks and the LED. What I have heard is that heat is the biggest cause of failure for LED bulbs; the power conversion adds to the heat load. It would be better to design an LED fixture that has the power conversion in the base and an LED bulb using non compatible connection so that the LED bulb can be replaced but not with an incandescent bulb.