Wednesday, March 14, 2012

Motion Sensors and Lights

Now that we know that we should always turn the lights off, the next questions is: Is it worth while to put motion or light sensors into the home to turn the light on automatically? Here is an excellent article, entitled "Does a Motion-Activated Light Switch Save Money?". The average consumption of the sensor is around 1W. So, for 24 hours a day, the sensor is consuming 1W. Government guidelines from Australia try push this "phantom" stand-by consumption down to 0.25W. Just this week I bought a lamp with 6 LEDs of which each LED consumes 0.06W, a total of 0.36W for all 6 LEDs combined. Instead of operating a sensor and a light one could just leave a dim LED light on all the time and in comparison to the sensor save energy and money. In conclusion, unless you are forgetful to turn the light off manually or for security concerns, a light or motion sensor for turning the light on at home makes little energy sense.

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