Systems, devices, and methods for instructing mobile devices, such as unmanned aerial vehicles (UAVs) (20), are disclosed herein. The technology provides a lighting system (200, 200a, 300, 400, 500) having a light source (201, 201a, 301, 601) and a lighting component (203, 203a, 403, 503, 603). A light source (201, 201a) is carried by the UAV (20) and emits light in a first direction (D1). The lighting components (203, 203a, 403, 503, 603) are carried by the propellers (29, 39, 49, 59, 69) of the UAV (20). The lighting part (203, 203a, 403, 503, 603) may comprise a light incident part (403a, 503a, 603a), a light transmitting part (403b, 503b, 603b) and a light emitting part (403c, 503c). The light incident part (403a, 503a, 603a) receives light from the light source (201, 201a, 301, 601), the light transmission part (403b, 503b, 603b) transmits the light to the light exit part (403c, 503c), and the light exits A portion (403c, 503c) directs light in a second direction (D2) to form a visual indication corresponding to the UAV (20).