Considering I've only had and used the lights installed to use just a little over one month, several of the light bulbs that came with this vanity light kit have burnt out; I'd have to say the life expectancy for the light bulbs are very short to say the least; they are expensive ($6.97 each), and difficult to find in stores.  Not a very common item. Knowing this information in advance, I would not have purchased this vanity light.