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The birds will be frightened and not to come back. Our lasers are using in many countries for farmers protecting their lands and scientists working in forests. Spartan 637nm 90mW Red Laser Pointer Control birds from 100m to 1km. This laser has a very bright red beam and very low divergence. The beam is still concentrated and bright enough to scare birds from long distance. Spartan 532nm 100mW to 300mW Green Laser Pointer control birds from 100m to 1km.
Light from the infrared (IR) one is almost invisible (and therefore very dangerous !!!). The red laser diode can also produce a powerful laser pointer or laser-show. I supply both diodes with current 175 mA. Interesting is that the laser unit is a kind of prism that combines the two beams into one.