2 Pack Automatic Photoelectric Sensor Lamp Holder Socket Senses Darkness or Daylight - Turns ON Lamps At Dusk and OFF At Dawn Automatically - For Standard Incandescent Bulbs Only by Perfect Life Ideas KEEP YOUR HOME SAFER BY TURNING LAMPS ON AUTOMATICALLY IN THE DARK. Lamp holder socket instantly turns any lamp into a home security system, protecting your home and family. Its built in photo sensors sense darkness and AUTOMATICALLY TURN ON, and turn TURN OFF in daylight. Keep your home safer when away from home by turning lights on automatically at night. FOR USE WITH ONLY STANDARD SCREW TYPE INCANDESCENT BULBS. The light sensor lamp sockets will only work standard incandescent bulbs that fit into a screw type of socket. For use with USA standard 110 Volts bulbs up to 150 Watts. The lamp sensor socket easily screws into any standard screw type light socket. NOT FOR USE WITH FLORESCENT LAMPS OR CHANDELIER BULBS. This is not for use with florescent light bulbs or for chandelier light bulbs and is to be used only with regular incandescent light bulbs with standard screw sockets. IF FLICKERING OR BLINKING OCCURS ADJUST THE DIRECTION OF PHOTO SENSOR TO A DARKER SIDE. If the bulb flickers or the lamp is not on steady, it means that the photo light sensor is detecting conflicting signals of light and darkness. In such cases, please turn the direction of the lamp so that the photo sensor faces a darker area to avoid confusing it or giving it conflicting signals of light and darkness. SAVE MONEY ON ENERGY BILLS BY TURNING LIGHTS OFF DURING DAYLIGHT. GREAT FOR EXTERIOR LAMPS. Saves money on energy bills by turning off lamps during daylight. This prevents them from remaining on when not needed to save energy. Great for exterior lights as they easily transform your exterior lights to come on at dusk and off at dawn.