Uniform Light

Nothing like a laser.
299 782 458 m/s.
Uniform light in a straight line.
Continuous stream of particles and wave at the same time.
Wavelength is exactly λ = 650 nm (a nanometer is 10-9 meters or in this case 0.00000065 meters).
In light wavelength it is long, in relation to the spectrum that is visible to us (humans).

Please see: Source or Photons.

Another spectrum: James Webb Telescope.