The 54-Watt T5HO spec (designed for T5 High Output lamps) ballasts are not recommended for linear 39-watt T5HO lamps. 54-watt T5HO spec ballasts are designed to drive each lamp at 460MA. 39-watt T5HO lamps are designed to be driven at 340MA. The ballast will overdrive the lamps (drive the lamps at an increased wattage). The long term affects are unknown for this combination.
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