Bright-Guard is an automatic electronic switch for controlling electric lights.

The complete assembly is the same size and shape as a standard wall-type  electric light switch and is designed to replace the wall switch using the same standard mounting screws and electrical wiring. No modifications to the mounting or wiring is required.

Bright-Guard consists of an optical sensor which detects the amount of light in the room and an electronic circuit which operates a sensitive relay for turning the lights on and off.

The sensitivity of the light detecting circuit can be set to one of three preset levels depending upon the type of application (i.e. to maintain a minimum acceptable light level for normal vision in an office; to turn the lights on under partially subdued ambient  light conditions; or to switch the lights on only under extremely low light levels).

The adjustment control is easily accessible on the face plate of Bright-Guard.  A manually operated switch is also available on the face plate of Bright-Guard to disable the automatic control and enable Bright-Guard to be used as a standard manual on/off light switch.

A unique feature in Bright-Guard is the extremely sensitive and reliable light sensing circuit.  The Bright-Guard product is not patented. However, a detailed description of the product and design drawings have been witnessed and dated by a notary public and two independent electronic engineers.