Here is MLT after 14h and with 1% light gain.
Surface exponent is something 40k in 1M scale (or 0.006688850931823) and texture scales it between from 1 to 0.25.
Is this normal?
And 40k x 0.25 is less reflective but 0.006688850931823 x 0.25 might be more reflective. So this is weird?
Sorry i should have started new topic.
EDIT, yes 0.25 was rising exponent, 4 was correct
I render now with exponent 2800, maybe burns less over
EDIT2, no it burned over. But i got it ok when i removed layered mat and replaced it with mix material.