Red glass problem strikes again!

The CoronaLight inside is absolutely white, (inside the red transparent LED glass).

I need it to be white in the center, as on reference pic above.

Why is it pink, and why is Green value -2? And how can I fix it?

P.S. It’s solved by making the red glass not so red. But I need it red. There’s something weird with the color math…

The question is, does the red diode/lamp really need a light inside. Couldn’t this be made for example with a bitmap in self illumination slot?