I want to install those movement sensors in my house in replacement for the old light switch. I want to use those from elevator halls which has a 3 way switch to leave on, leave off and leave monitoring.
The thing is: is the sensor energy consumption lower than a 15w to 25w white cold lamp in the hours that I simply leave it on when nobody is around?
These sensors are still expensive in my country. So I will install them only if it's worth the energy economy on long terms.
This is the kind of sensor I am speaking of:
And this is the bulb I am speaking of: