hand changes in brigtness when rotating

hand should stay the same in whatever rotation angle you are

the hand isn't always the same brightness

Reproduce:
in the night rotate (slowly so you can see it clearly when it changes)
thats all I was in creative so maybe that is requerd as well
I was in a high y cordinate (150+-)
It was in windows XP so maybe this doesn't happen on windows 7 (didn't try it at home this was when I was on school they only have winXP there)