Perhaps you have already posted exactly which ones you installed, but if you wouldn't mind sharing again so everyone knows to which ones your are referring. Sounds like you have a high Kelvin rated bulb.
I have decided to stay clear of GP's as I keep hearing code issues. I wonder if there is a temperature sensor near the bulb that does this since the bulbs do run hotter as they are tinted reducing their ability to throw light, and instead create more heat. Finding that balance between light tint and minimal heat is the key, and hence less purple and more white. I'm guessing in the 4000 Kelvin area.
, ordered 5.11.16, custom build in process.
Dropped in Munich on 9/28, Redelivered by ELEKTRA, delivered to my home 11/2.