While not typical, I am running a pond one, 55 watts, this one.
http://www.amazon.com/Jebao-55-watt-Clarifier-Sterilizer-Aquarium/dp/B00K1HHG9U
It is a pretty good deal.
Seals are weak, so teflon it and mount over your sump.
Worth a shot if you are looking for high watts for low $$