my foglights keep burning out and i havne't had them for very long. i bought silverstars approx 4 months ago and the left one went out about a month ago and i just noticed that the right went out. i don't wana have to keep buying new bulbs each time this happens. do you know of any causes for this. i bought my silverstar headlights before the fogs and both are still working properly. are the blazertechs worth the money, and how hard is it to install them?