Dim Dash Lights

There's no basis for the idea that removing the blue balloons makes the dash light "harsher" or makes your eyes tired faster. Blue light is actually the hardest type for the human visual system to process, but that doesn't enter into the equation here because those balloons change the light colour only very slightly.

That said, if you specifically want to make the dash lights as eye-easy as possible, then use these instead of the previously-linked ones. Yellow-amber light without the blue balloons, or slightly greenish-yellow light with the balloons.