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405nm is not blue its violet bro. Blue lasers are 445nm or 450nm.
A single mode PL450B at >250mA should give you a nice little tight beam. An M140 would take more power to make a visible beam since the beams they make are wider. So it depends on the diode and the diameter of the beam.
A single mode PL450B at >250mA should give you a nice little tight beam. An M140 would take more power to make a visible beam since the beams they make are wider. So it depends on the diode and the diameter of the beam.
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