Well , FOG Lights are not and never integrated in the headlights. As per global lighting standard both Federal motors vehicle US as well as European standard for lighting, SAE, FOG lights are separate lights and MUST be installed BELOW the headlights elevation on road going passenger vehicles . I mean there is clear cut specifications with maximum and minimum distance requirements from ground surface as well as the distance between headlights and fog lights.
"FOG BEATING HEADLIGHTS " is just a marketing gimmick and advertisement of headlights BUT headlights cant function as fog lights.
Anyways was just clarifying the confusion on basis of information I know.