Automatic sensor lighting is a highly trending technology even in Nepal now. It is highly effective to save electric energy at homes, hotels, apartments, street lights etc. Day night sensor lighting automatically switches on the lights when it gets dark and switches off during daylight. PIR and microwave motion sensors allow lights to switch on when it is dark and there is motion detection, otherwise it switches off after some delay. Microwave motion sensors are more sensitive than PIR motion sensors. Sound sensors allows lights to turn on when some sound is detected and turns off when no sound detected after some delay. They are usually used at the corrider, staircases, bathroom, balcony, entrance of buildings.