Running the two filaments of the H4 bulb at the same time wouldn't be too much for it? And the same for the circuitry. I think it's designed for carrying 60w at the time, not 115w. I'm thinking too in the reflective housing of the headlight, perhaps it's too much hot for it.
I usually use the beam button to activate both filaments and see in the corners, but i don't dare to make it permanent.
In other hand, i'd like to put two led "fog" lights, but here's imposible without a CE mark, and even with that it's difficult to get "MOT" approved.