Green Laser Wavelength Meter
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A study called "Green Laser Indicators for Visual Astronomy: How much power is enough?" Twenty-three observers adjusted the power of 532 nanometer green laser beams to "propagate into the sky and the atmosphere in heavily polluted urban environments." At a minimum, the power of the beam can be clearly seen between 1.4 and 5.6 mW. The average value of all selected power is 2.4 mW. The authors conclude that "green laser indicators with output power of less than 5 mW (Laser Grade 3a of the American National Standards Association or 3R of the International Electrotechnical Commission) seem to be sufficient to educate night outdoor activities and provide bright beams with a reasonable level of safety."