The worst case scenario is there are 36 lights on one circuit. Calculations, per fixture cutsheet, and metering both show 40A at normal operation for this circuit. 40A X 1.25 = 50A ckt bkr. However, metering (24hrs/day for a week) shows that this circuit during the first 2 seconds ramps up to about 75 amps then operates at the 40 amps aforementioned. 120V circuit. The only solution I see to not exceed this 50A bkr is to add another circuit to split up this circuit. The less cost effective solution may be able to change out the ballast to 240V. The most cost effective solution would simply put an 80 A breaker in, but I think that is not code compliant since, I think, you cannot exceed 50A breaker for a lighting circuit.