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UV Sterilizer Bulb

Does a UV sterilizer bulb degrade?  I seem to remember reading that 
flourescent bulbs work by giving off uv light which is tranformed into 
light with other properties by the coating inside the glass tube.  So does 
a bulb with no coating gives off uv light?  What's there to degrade?  I 
suspect someone's going to give me a very good reason why they do degrade 
so my next question is where can I get bulbs for a Rainbow sterilizer CHEAP?