IMHO, you should have moved the existing bulbs to the closet for if/when the new ones fail, so you can enjoy your upgrade. :) To answer your question, it reall

IMHO, you should have moved the existing bulbs to the closet for if/when the new ones fail, so you can enjoy your upgrade. :) To answer your question, it really depends. If they run cool, are a good design, and aren't defective, they will last incredibly long. Often, one or more of those things isn't true.