The original incandescent light bulbs give the light plates and the digit drums a yellow tint. Especially on older light plates, the entire legend turns to a rather hard to read yellow. Bright White LEDs are normally calibrated for 5200K (daylight) and will help quite a bit with the faded instruments.
In the image above and the below, the radio had that has been re-worked from incandescent to LEDs is the one on the left and on the bottom respectively.
Removing all the original lighting and replacing it with LEDs is quite labor intensive ... it takes about a two days to work a single radio head ... but the results are awesome.
