While ago I learned about those miniature STROBON totally self contained lights . . . I meant to post something … . STROBON works GREAT! . . bought a couple more since and just wanted say it was part of the reason I developed FVLOS (Forward Visual Line of Site) . . I have officially had it accepted by Transport Canada in my SFOC Standard Operating Procedures(SOPs). With a STROBON I can fly my Mavic or P4P+ more than a mile away at night and during the day with a Forward Observer up to a 1/2 mile from an observer that may be a mile away from me depending on lighting conditions.
Thanks for the ideas that came from them . . especially if you invented these things. Explanation of FVLOS here with use of STROBON.
How Far Can You See a Drone
Great help site . . will keep following