He's refering to flourescent lite tubes. Point your tach at a tube here and it will read 3600. On european currant it will read 3000. Sounds like you have the same current as here.
As far as getting the lowest idle, bypass engines will not idle as low as reed valve engines because of the turbulance and tendency of the carb to spit fuel on the bypass engines. Tuning and tinkering, and adding a velosity stack will help, and an airfilter to cover the stack. As the idle gets lower so do the vibrations get more violent on the airframe. So only go low enough to land safely.