Directional indicators doing their job too well

Is there a standard which is defining that turn signal lights have to be so bright that they will blind you every time you wait at traffic lights?
It's like car industry version of tv add, which will blow your mind after tight concentration of a movie like "NOLLA SATA SATA, MITEN VOIN AUTTAA"!!! Luckily they tuned it down to the level of normal adds. And why is it necessary to have higher volume on adds than on actual tv content - really?