I just went through almost every warm white bulb from CT, pbl and Comet on my em.
https://pinside.com/pinball/forum/topic/gottlieb-playball
Post 13.
They ALL are different. I only liked the CT Frosted Warm White. I would suggest doing what I did, buy 3-9 per kind to sample, so you can put them in a few areas and get an idea of what looks good. Many are way too bright, white or yellow. I wanted a incandescent look and while NONE provide the exact look, the CT Frosted WW was the best I found.