Quoted from DCFAN:Have the monotone insert lights been discussed? The pictures of the Pro that were posted from Australia appeared to mainly have clear inserts and white bulbs?
Not much according to my memory...
For me it seems like Stern planned to use RGB LEDs on all models, but realized that they have to cut costs on the Pros in the last stages of production....i.e. after the playfields were already made with white/clear inserts.
I could be wrong, but TWD looks somewhat unusual colorless - almost to much to be a design decision.