the link is dead.
were they 35w or 50w ballasts on the conversion kit?
50w will be to hot for the plastic fog light body.
Also, while it might seem 'brighter', understand that a lamp w/ a halogen bulb has an entirely different reflective body(the inside of the lamp) than a Xeonon bulb.
When they sell these 'plug n play' kits, all they are saying is the the bulb will fit......ie the base of the xeonon bulb is altered to fit the notches of the halogen bulb.
Everyone takes a picture looking AT the car. wrong. The picture should be of the light pattern on a wall at 25 ft.
Xeonon bulbs need to be in a projector type of lamp.
this is a projector fog lamp. the is a curved optic lens, The body is metal:
this is a halogen fog lamp, shorter body, no optic lens;
you want a pattern that looks like this, with a cutoff. otherwise you'll blind the other drivers and get less light on the road.