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couldn't you just use a big cap. to dim them when you are turning them off.....
huh? .............
Normally when you have a capacitor, it keeps the charge after the power is off, and it slowly goes away, creating a dimming effect.
If im wrong sorry.. thats how i always looked at it.
A large capacitor will work.
If you know the voltage drop of the LEDs and the series resistor then it's easy to calculate the current decay.
You'll need a pretty large capacitor though, assuming the LEDs are in series and the resistor is 150R for a current of 10mA, a 6800µF capacitor will give an RC constant of just over a second meaning it'll take about 5 seconds to turn completely off.