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Questions often raised may be important to share with you on choosing the color of these blades ,they may be “Black or Black stripes / White/ Grey/Red/Combinations/Else”which you may be better aware of  ,in context to the risk free movement of indigenous species.

I think to avoid  fkying species collision right use of Tetrachromacy phenomenon color combinations thereby impacting the Visibility Spectrum even at night without using lights for both for visibility issue & thereby heat may be a cost-energy effective measure and simultaneously by Minimizing Motion Smear / Motion Blur may reduce this impact of collision to a considerable extent .

Cheers

Joy