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The recommended wiring diagram by Fulham is number 11 (the second wiring diagram) for two T5HO 39-watt lamps on a workhorse 6 ballast.
Using the first diagram will under drive your lamps. This is not recommended with instant start ballasts. The lamp cathodes need to operate at a certain temperature. Under driving the lamps will result in a lower than recommended cathode temperature. This will wear and cause excessive spurting of the cathodes (lamp ends).
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