Do you do enough night driving for it to matter? Many people strictly avoid night driving for a variety of reasons.
My car hasn't run in a while, but when I drove at night I didn't mind the soft dim light of traditional bulbs. I'll be replacing bulbs with stock bulbs when my instruments come out.
If you drive a lot at night, maybe the LEDs are for you. That's a personal choice.
The light dimmer control works on a rheostat - an arm sweeps across a spring to vary the voltage (or something like that, I'm not an electrician). Often corrosion builds up on that spring, so clean that if you can.