Only one light trail can be found in the original photo, however, when contrast is heightened, other two trails appear above and below the center trail. â  photo was taken in pitch-dark balcony without any room light, which means the only strobe light could have reflect the flyingâ â objects. the speed of strobe light is at lease 1/10,000 second, which means any bugs cannot leave such long trails by reflecting strobe lights. â  besides, it is unconsiderable that three bugs flew at the same time and left only straight trails with different directions. â  photo was examined by the professional photographer and was concluded that all three trails seem to have illuminated by themselves. â  attached room photos prove that room light is reflected at the left part of handrail and only strobe light is reflected at the center area of the handrail, which means the photo was taken only by the strobe light that speed is usually between 1/20,000 and /10,000 second.