LED tail lights

>LED tail lights
>incandescent turn signals

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incandescent fade so nicely and smooth on and off.

LED blinkers make you have seizures in traffic jams

Don't use your turn signal you scrub. Problem Solved.

>programming a fade is hard

Well, yeah. LEDs don't like dimming in general, and they definitely don't get as dim as incandescents.

>LEDs don't like dimming in general
they dim just fine if you use a constant current source

>I have no idea what tolerances or indeterminate ranges are
LEDs are more efficient than incandescent lights, which ironically makes them harder to program fades for because they have lower margins of error. If you can program an incandescent bulb to be on from (hypothetical) 5-3, fading from 3-1, and then 'off' from 1 to 0v, you have a much wider range for components that aren't precisely engineered. if your typical LED runs at 3v, then you not only need to run a resistor or something to drop the voltage from 5 to 3, you also need to run a repeater or something to give it the fade effect. I'm sure you can find higher voltage LEDs but the ones I've worked with usually run at between 1.5 - 3v, and I'm an apprentice electrician.

If you were really motivated, you could make LED turn signals as well as LED taillights, but where the tails are always on at night, the efficiency is worth the restriction of tighter tolerances...
while for turn signals, the occasional use and increased power draw is better than dealing with the long term finicky-ness of LEDs, and as your car ages, the relaxing tolerances.

>Tl;dr LEDs are strict on tolerances, incandescents eat more power but are more forgiving, if it ain't broke don't fix it

>"LEDS run on voltage"
>apprentice electrician

LEDs run on current. You re gonna stay an apprentice for the rest of your career.

ITT: Bulb professionals

V = IR where I is basically V when R is minimal. You're playing pedantics to avoid from your 'proposition' not feasible.