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These numbers, 610-720 nanometers are wavelengths that fall into the red end of the light spectrum. They have no direct relationship to watts which is defined as, an amount of power, especially electrical power, expressed in watts or kilowatts
There are 1 billion nanometers in a meter. Therefore, 100 nanometers is equivalent to 0.0000001 meters.
925 NM likely refers to the wavelength of a light or electromagnetic wave, specifically in the near-infrared range. The "NM" stands for nanometers, which is a unit of length commonly used to describe the wavelength of light. In this case, 925 NM would indicate a wavelength of 925 nanometers.
To convert the wavelength from nanometers to angstroms, you divide by 10. Therefore, the wavelength of the red light beam, which is 638 nm, would be 63.8 angstroms.
The longest wavelengths visible to the average human being are in the range of ~700 nanometers which appears to be red to the human eye. However, I am capable of perceiving the red light that my 2 Logitech cordless laser mice emit at 848 nanometers. I hope I am not damaging my eyesight, but I don't believe the emission spectrum for such a laser would be very wide, so I would bet that 800-820 nm is still in the visible range, at least for younger people. I am 22 years old. the longest wavelengths of visible are red colored
The longest wavelengths visible to the average human being are in the range of ~700 nanometers which appears to be red to the human eye. However, I am capable of perceiving the red light that my 2 Logitech cordless laser mice emit at 848 nanometers. I hope I am not damaging my eyesight, but I don't believe the emission spectrum for such a laser would be very wide, so I would bet that 800-820 nm is still in the visible range, at least for younger people. I am 22 years old. the longest wavelengths of visible are red colored