What is the key difference between the 'Nominal Range' (Alcance Nominal) and the 'Luminous Range' (Alcance Luminoso) of a marine light?

1. Nominal range is the luminous range under a standardized meteorological visibility of 10 nautical miles, whereas luminous range is the actual visible range under existing local weather visibility
2. Nominal range is measured with binoculars while luminous range is seen with the naked eye
3. Nominal range applies only during daytime while luminous range applies at night
4. Nominal range is determined by Earth curvature while luminous range depends on battery voltage