SPECIAL NOTE These ballast can ommit RF interference. If you are using a Neptune/Octopus type system that uses X10's to communicate, these ballast could cause a problem turning your equipment on and off. If you are not using X10's this is not a problem. There has been a few problems with TV reception, but this is less common.
http://www.premiumaquatics.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=PA&Product_Code=E-BAL250&Category_Code=Eballast