Traditionally, fogs serve a different purpose than driving lights; they're meant to have a wide throw to be used for low speed driving in inclement weather. Bulbs are different, reflector design is different; if you look at some fog bulbs they even have an opaque cap on the end of the bulb which limits the forward throw.

I wouldn't expect these to overpower the headlights, but they should supplement road coverage; headlights will light up the road long and forward of the bike, these should light up the road short and sideways of the bike... in addition to providing better noticeability in the daytime.

Just adding perspective in case some are expecting these to be driving lights.