Red Beam Laser

why are green lasers brighter than red?

hey ive noticed that in the dark the green laser beam appears brighter than red why is that? and the same output power to 1-5mw

Open Sky is correct. Green lasers appear brighter than red lasers of the same power because the human eye is most sensitive to the color green (specifically 555 nm). And the reason for this is that the sun's power spectrum peaks in the green, as well, so the human eye has evolved to be most sensitive there. Therefore, we see green lights as much brighter than equally powerful red lights. It has nothing to do with the energy of each photon because blue lasers (which are very expensive) are not even brighter than green lasers, though they are higher energy per photon. Instead, they are no brighter than red lasers, since our eye sensitivity drops back down at these higher frequencies (shorter wavelengths).

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