Dimmable LED's for Map Lights
 

I searched around over in the "Body Interior Exterior Lighting" section and didn't find anything. I would like to swap my interior bulbs out for LED's but I really like the way the Map lights dim before turning off. Anyone know if there is a LED bulb that can dim like the incandescent?

Unfortunately no. The OEM bulbs dim because it's a filament. When power cuts off, the filament cools down, creating a dimming effect.

LEDs have a faster response so it doesn't "dim" naturally, unless you want to add a other things to it. But it may not be worth the trouble just for the dome light.
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ucla bruin is correct. Let me preface this by informing you that i am the engineering manager at a company that develops LED lighting systems. Often you will find crap info on the net but what im about to tell you, you can trust

You could put an electrolytic capacitor in parallel with the LED and its ballast resistor. Would need to be rated at 25VDC, probably 10uF should be a good starting capacitance. The more capacitance you chose the more charge it will hold and the longer it will take to discharge. If you cant find a value big enough to discharge at the rate you like you can add capacitors in parallel to increase the total capacitance.

Interesting concept, in a previous life I took some electrical technology courses and yes, I do remember capacitors store electricity. I'm not that ambitious though :)