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They both put out about the same light.
The e-ballast probably controls the bulb burn closer to specs. The PFO HQI is really not the proper ballast for Radium bulbs. It drives them at 430 watts for example. Bulb life MAY be longer with the e-ballast although I have no confirmation on this.
The proper ballast for a 400 watt Radium may turn out to be a HPS ballast.
Perryinca is working on that as we speak.
John
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"The state is the great fiction by which everybody tries to live at the expense of everybody else."
Frederick Bastiat
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