I checked them out and wonder what kinds of battery they take....3 triple a batterys per lite would shorten your normal flight time..and i see that each unit weights 75 g and kinda confusing what they mean by the Package Weight:0.1kg (0.22lb.)
I really Think a strobes much better.....a constant on will drain the batteries faster....i have home made strobes on my P3....and i can see my drone easily two foot ball fields away nicely at night !....mine take three LR 44 button bells and i buy 4 for one US dollar.
takes at least 42 days to get to you from China.