Cheap green and blue laser pointer units can output a lot of infra-red (in other words the frequency-doubling/trebling crystal isn't working efficiently). They will also be less reliable. Simple equation, cheap = corners cut.
Cheap green and blue laser pointer units can output a lot of infra-red (in other words the frequency-doubling/trebling crystal isn't working efficiently). They will also be less reliable. Simple equation, cheap = corners cut.