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how come they only drive a vho bulb to ho levels? is this not a vho ballast?
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It has to do with the Icecap circuitry. I believe it runs them at lower wattage but slightly higher frequency.
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How about a Fulham WorkHorse 7 ballast?
Is it consider a HO or VHO ballast for 2X48 inch bulbs
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If you wire them in parallel (as in the manual), a WH7 will power 2-48" tubes to HO level. Wiring them in series (like one 8' tube) might run at close to full VHO level as a WH7 can run 2-96W PCs, though I have never done this.