I was looking digital but the more I read about the electronic ballasts the less I liked what I was reading. Seems they have serious issues and the power saving is not that dramatic. After doing my homework I decided I want to go with a ceramic metal halide bulb which solidified my choice of a magnetic ballast as they don't run off of e-ballasts. Then I came across the powerhouse ballasts and was very impressed by the 8 year warranty. No one even comes close to that which leads me to believe they must produce a damn good product if they are willing to back it with that kind of warranty.