I don't have a WK7 any more, but like Steve said, if you use only 2 red wires per 48" VHO bulb, they will only work at HO levels.
Since the max the ballast will put out is 220W, 2x48" in series with all 4 red wires, should give you 220W, but I don't know if this would fire up. I have only used 36" bulbs in series, they ran for 1.5 years no problems.
Lee
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Need more time for the tank... Break a leg!
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