The human eye sees green four times better than it sees red and therefore the relative distance that the laser line or dot projects seems further and brighter if it is green. This equates to better performance over longer distances and hence improved accuracy from a green beam diode.
Which laser suits my task, red or green beam?
Overall a green beam laser is now the optimum choice for all trades that are predominately undertaking internal tasks. For builders that do a variety of indoor and outdoor tasks a green beam is the best choice.
A red beam laser with a detector is still the preferred choice outdoors and can also be teamed with a machine control receiver which attaches to a skid steer loader or excavator.
In summary the general classifications for trades to beam choice is:
Red Beam – Earthmovers, landscapers, concreters, drainage plumbers, civil contractors, steelworkers
Green Beam – Building contractors, all internal trades, tilers, electricians, plumbers, interior designers, glaziers, painting and decorators.