if your dog knows his job , dont think there is a max distance,,if you can see it , he will find it in the beam,,alot of it will come down to experience of the both of you working together, the only problem with long shots are keeping the lamp on something you cant really see once the action gets going,,,reflective collar on the mutt can help, it will give you an indication of where the actions at,,
AT LAST CASSO GOOD ADVICE FOR A CHANGE.
SEE YOU CAN BE HELPFULL WHEN YOU STOP THINKING YOUR BETTER THAN EVERYONE ELSE 3TS.