My eyes may be tired or I may be expecting too much but yesterday I flew my first flight with these on and it was a bright overcast sky and these lights didn't really do much for me. And, I wasn't far away either. I had them set to flashing as well. I'll work with them more and see how it goes but for daytime they weren't cutting through as much as I'd hoped. I'm sure night flying they will be effective. It can be said that they do show up in daytime though, which is more than the phantom itself provides and which amounts to nothing really. They just don't cut through as much as I wanted. They are small leds after all. Better than nothing in daylight, I suppose. Super effective for orientation, no imo. Maybe something your eye could catch to help you spot the bird out there, but nothing more. Looking forward to a night flight.