The FAA does not specify a measured distance for VLOS for a recreational pilot. But the question you need to answer is “At what distance can I accurately discern my drone?”
Also, strobes are not designed to replace VLOS but rather to enhance it! With that idea in mind, before you turn DRONE loose in the night sky at long distance, start short and learn!
Also, strobes are not designed to replace VLOS but rather to enhance it! With that idea in mind, before you turn DRONE loose in the night sky at long distance, start short and learn!