Aqua Ultraviolet Advantage 2000+ Transformer, Black, 15 Watt

I had the lower-power version of this sterilizer ("Advantage 2000"; a 7w unit) for several years before the bulb finally died. My local aquarium store mistakenly sold me the higher power Advantage 2000+ 15w bulb. A call to Aqua indicated that I could not reliably run the 15w bulb from the 7w transformer (I supposed as much), so I ordered the 15w transformer to match the new bulb and it works just great. I have a 150 gal aquarium and although the 7w bulb did keep the algae at bay, I figured the 15watter should do a little better; it certainly took me from opaque green to crystal clear water in about a week.