a pre selected 2 dimensional area or 3 dimensional space if after a predetermined period of time and within the pre selected area the motion or absence thereof is detected by sensor 20 a signal is transmitted to ballast 18 via wires 24 to activate or de activate the lamps it will be appreciated that sensor 20 is attached to housing 10 via two stems 26 and 28 connecting stems 26 and 28 is knob 30 which provides rotational movement of sensor 20 in 2 planes vertical and horizontal the sensor is thus adjustable in 2 planes for better detection it will be further appreciated that sensor 20 is positioned slightly off center with respect to a hypothetical axis running parallel to the shorter sides 32 of housing 10 and dividing housing 10 into two equally measured parts such location of sensor 20 on housing 10 allows the inventive light fixture to be placed on a ceiling in such a way as to avoid pipes heavy duty cables railings and other obstructions which might interfere with the positioned light fixture it will be appreciated even further that housing 10 comprises additional alternative three locations 34 as shown in fig2 which might be.