We run this thing right next to the cat litter ...
We run this thing right next to the cat litter box.  Makes a big difference.  The bulb does need to be replaced....when you start to smell the litter box, its time to change bulbs.  Ours ran 24-7 for at least 6 months before we felt the need to change bulbs.  Seems to have done the trick.
Rating: 5 stars