Note: the 470 ohm resistors can also be soldered on the lamp driver module.
https://pinside.com/pinball/forum/topic/adding-resistors-to-the-aux-lamp-driver-to-eliminate-led-flicker

That's personal preference. The best natural color for a classic Bally backglass like this is to skip LEDs and use incandescent bulbs. If you must use LEDs, use all warm white or sunlight bulbs,.

I think it would look best without colors....experiment with different whites, but please no exotic colors. Color temps probably somewhere between 2000K and 2500K would be worth investigating.

The characteristics of LEDs behind backglass art that tend to be problematic are threefold: color, brightness, and direction. The ideal LED in my opinion would address all of those.:
A proper color temperature that increases the contrast of the art.
A proper brighness- too bright washes out the details, so that almost as bad as too dim
A spread that avoids hot spots, more illumination to dead areas between bulbs.

IMO, there are some decent LEDs out there but we have yet to develop the perfect LED. One idea I have would be to modify the backboard with RGB/White LED sheet. These can be programmed with a microcontroller to dial in the color and brightness, while filling in the spaces between bulbs for a nice even illumination (almost as if one bulb lighting the entire glass)

Sorry I've strayed so far off topic....carry on

929093367_165 (resized).jpg