Abstract: A light responsive control device comprising a light sensitive element, having a resistance which corresponds to the amount of light incident thereon, and an electromagnet having its coil connected in series with the light sensitive element. An armature is operated by the electromagnet so that it engages a contact member positioned below the armature when the electromagnet is deenergized and is separated therefrom when the electromagnet is energized. A non-magnetic element is secured to a surface of the armature to assure prompt release of the armature when the electromagnet is deenergized and a non-magnetic guide pin attached to the non-magnetic element extends into an aperture in the electromagnet to guide the movement of the armature. When the ambient light impinging on the light sensitive element is low, its resistance is high and a load connected between the armature and contact member is energized.