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    Track and Field Laser Pacer - How powerful of a green laser do I need to see it clearly at a distance 150m in daylight?

    I am building a system ( really just a raspberry pi and some servos ) for pacing athletes around a 400m track. I am completely new to lasers, and so I have been looking for answers on this forum, but can't find the right answers. So I need to know: - How much power to reach 150 meters clearly in...


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