Different people see it differently AND the conditions of the air (humid, dust, etc) significantly affect the beams visibility. There is no good rule for this.a bit of a noob question, Since violet is a less visible wavelength, about how many mW would 405 nm need to be in order for the beam to be visible in a dark or lightly light room?
My eyes are old. I need at least 300mW to be able to see the beamoh i see what you mean. the people's eyes are different... im thinking the driver i have is jsut really crappy then.. i put the multimeter to it and it reads .35 amps. but when i hook it up to the diode the dot is kinda bright but not really impressively bright.. it can light matches when tightly focused and burn the match stick but i thought that would just be from the wave length having a greater effect on the material.
@jay.. your pretty close to me im thinking air conditions are pretty similar.