There seems to be some variation in what people are getting, perhaps due to different vendors, the risk you are taking with Revain. I ordered one just in case (although I have 3 GG1100Ws); The one I received was identical to the ones that came with my GermGuardian. I used to be skeptical about how well they work with smells as I just hadn't noticed before, but one of mine stopped working a few months ago and a second bathroom I don't really use and one day I went in and noticed how musty it was and that my GermGuardian was glowing red-orange. Replaced it with one of these and the next day the muff was gone. I have just ordered more for my other units although I will say that one of them still has the original bulb from over 2 years ago and still works despite the description saying they need to be replaced every 6-8 months .
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