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Firstly, you can "almost" travel at speed of light, but never reach it. In that situation, all the actors would see the flash light traveling at the speed of light, independently on their speed. The light, always goes at speed light, independently on the speed of the viewer. If a car goes at 80 mph and you also goes at 80 mph, you will see the car stopped, but the light always goes at speed light relative to all viewers That is one of the most strange things of relativity theory!!
You can see a distant flashlight better at night, because it isn't overwhelmed by atmospheric diffusion of sunlight. But since air is usually stiller at night (less convection from sun-warmed surfaces, less disturbance from traffic), it has less particulate matter, so absorbs less of the light.
Yes, it will affect your eyes. You'd better not shine the light directly into the my eyes. If your eyes is not comfortable, please consult a doctor as soon as quickly.
