We have had the discussion about Weather Minimums and actual Visibility where there is nothing to look at such as Offshore and no surface lighting (boats, rigs, platforms, Gas Flares) and have to recall the Rule does not necessarily comport with reality when we use "visibility" as part of our Go/No Go decisions. If there is nothing to be seen.....but you have the required visibility...by Rule you are legal but in reality you are IMC despite the Weather being VMC.
It gets rather Dark offshore most nights....especially with an overcast and no celestial lighting....but hey....you are VMC....right? If VMC....why do we have to fly by sole reference to Instruments? Should we not be able to control the aircraft by outside visual reference if we are really VMC?
In the USA....under Part 135 (Air Taxi) surface light reference is required for Night VFR.....but under Part 91 (Non-Commerical Flight)....there is no requirement for Surface Light Reference. Go Figure?