A light probe for use with a photometer includes a silicon photo-voltaic sensor mounted behind a specially designed lens which accurately corrects the sensor to a cosine distribution curve. A light-blocking eyebrow is disposed around the lens to control the light relative to the lens surface. The measured light distribution as detected by the sensor is a function of the curvature, diffusion factor, and surface roughness of the lens, and the relationship of the eyebrow to the lens.

A shatterproof light diffusion plate is mounted to the riser of a stair with the upper edge of the plate immediately adjacent the forward edge of the tread. A source of light illuminates the diffusion plate, and transmits light to the upper edge to also illuminate it, thereby providing a visible line marking the front edge of the tread for guiding traffic up and down the aisle and defining tread depth.

A light assembly for a hospital room head wall having means for positioning a bed with respect to the light, means providing a source of electrical energy for the bed and means responsive to interferring movement of the bed with the light to interrupt the supply of electrical energy to the bed.

A plumb light is provided which is operable for establishing the position of a point, the location of which is unknown, through the use of light when the location of another point is known. The plumb light comprises a frame, light means, mounting means for the light means supportable on the frame, and index means. The frame consists of a planar member having a multiplicity of legs extending outwardly therefrom at preselected angles relative to the major axis of the planar member and means formed...

The traffic light dimmer saves electrical energy in the night-time hours by passing only a given number of cycles of alternating current to the lights during successive time intervals. Essentially, a switch is connected between the source of energy and the traffic lights and a gating pulse is initiated every N.sup.th cycle of the alternating voltage source. The time width of the gating pulse can be adjusted between zero and the time for N cycles to pass so that a desired lesser number of cycles ...

A light fixture in which the non-electrical end of a lamp is held by a socket having heat insulating and cushioning surfaces arranged in a generally conical pattern.

A portable light which includes a light assembly mounted on a reel by means of a swivel mount, which reel is equipped with a suction cup to enable positioning of the light on the dash or other smooth surface of a motor vehicle. The swivel mount is designed to permit the light beam to be adjusted while the light is positioned on such a smooth surface by means of the suction cup. The light is capable of being moved into substantially any position by the user and the cord may be wound and unwound o...

A light guard molded from an electrically non-conductive synthetic resin and including a reflector member and a cage member provided with integrally molded hinge and latch means for retaining the members in latched relation against significant unlatching forces to which the light guard is subjected during use.

A light modulator comprises a crystal of the m3m class such as potassium tantalum niobate in which electrically-induced birefringence is obtained by setting up a field within the crystal in a direction which is not parallel to any of the crystallographic axes. With this orientation of the field (preferably at 45.degree. to the axes) the crystal becomes birefringent for light travelling parallel to the field direction. The birefringence is proportional to the square of the field. The modulator ma...

A disguised emergency light for use on vehilces. Besides the standard source of light, the light includes an internal light channeling device and a beam splitter and is adapted to fit into standard vehicle light sockets. Predetermined color variations in both the illuminated and non-illuminated condition of the light is disclosed.