Hi Andrew,
The electronic ballast will underdrive your lamp somewhat, however you're probably only looking at about a 7% difference or so. If you were going to run the bulb until failure, rather than spectrum change, then the electronic ballast would be the way to go. Typically we change our lamps out when the spectrum starts to shift, rather than when the bulb dies, so you're really not gaining any extra useable life from the electronic ballast. The electronic will put off less heat, but in the Spacelight that we were talking about it is internally mounted so the heat difference may not be as great with the remotely ballasted Ocean Lights.