Total wattage would be for 125 fluorescent tube lights? I need to determine how much kva generator required?

Depends on the wattage of the tubes. This is usually 20 watts. so it'd be 125 times 20 watts which is 2500 watts, or 2.5 kva. On top of this is the start up current which doubles the power requirement. So I'd recommend a 6 kva generator if the fluoros are 20 watts. If they're 40 watts, you'd need an 11 kva generator.