I wouldn't worry too much about LED colour Dave just choose your preference. You can always buy a variant with higher lumen output, if not now then in the future. From a practical point of view daylight white seem to be best for nightime illumination. Certainly the LED strip lights in my garage with three selectable colour temperatures between warm and daylight white are all set to the latter.
With regard to using your fogs for daylight awareness, you may be interested in the switchback LED's I have fitted in front indicator position. Description of conversion starts
here. Definitely the best electrical mod I've done to Morton and all using existing loom cables. Car passes MOT without mention despite not being able to turn them off once ignition on, as ex factory.
