If you switch all your interior lights to a different color LED (blue), does your light dimmer (the roller thingy on the dash) still work? I never use that thing anyway but i was curious about it.

 

I have LED's in my dash. They turn down slightly and then just turn off. So basically no the roller switch doesn't do anything except click them off.

 

The dimmer works, but has no more practical effect. LEDs you would want to pay for won't dim very well like regular bulbs can



LEDs work differently to incandescents. There is a narrow voltage range where they will work, whereas an incandescent bulb will just glow dimmer until there is not enough voltage to keep them hot enough to glow (this is also why LEDs won't drain your battery totally flat like a regular bulb left on). IF you had some LEDs that had a voltage controlled current regulator, you could dim them to an extent. If your LEDs are just lined up in series with maybe a limiting resistor, you get almost-no dimming compared to incandescent lamps.

 

Yes the dimmer still works. But barely. I have almost only LEDs in my dash, and they dim just a tiny little bit when moving the dimmer roller. With regular bulbs, moving the roller from min to max makes it go from like 1 to 10. With LEDs, that 1 to 10 is more like a 9 to 10. Very minimal.