I noticed when I applied 250 half white Lee diffusion filter on the barn doors of my Arri 1k, that it changed the color
of the light even more yellow.
Despite the fact that the camera was balanced for tungsten. It was even worse when
I doubled up, the diffusion.
This effect may or may not have happened when I used a dimmer to lower the light power, it had the same effect.
If this is normal, this will make color balancing a nightmare. The lights were not on for that long, say half hour or so.