Light-sensitive device used to operate fixtures according to available daylight. They are used in solar lighting and to turn outdoor or security lights on and off at dusk and dawn.
An electronic device that, when modulated by visible light, produces electrical impulses that can be amplified to drive audio speakers.
photoelectric cell; the light-sensitive component within a photosensor. The actual device might be a photodiode, a phototransistor, or a photoconductive cell. It is important to make a distinction between a photocell and a complete photosensor device. A photocell might be any device in which light controls the electron emission from a cathode, the electrical resistance of an element, or the electromotive force produced by a cell; it is usually incorporated in an electric circuit and used in mechanical devices such as door openers or home outdoor night lights.
equipment used to switch circuits at adjustable light levels
A form of switch that is operated by light. Mostly used for automatic switching of external lighting to coincide with setting of the sun.
It is a solid-state device which converts light energy into electrical energy by producing a voltage (example : photovoltaic cell)or use it to regulate the flow of current (example : photoconductive cell, as in automatic control systems for doors, lighting, etc.).
a device that produces an electric reaction to visible radiant energy (light).
detects changes in light levels and provides an automatic output switch when lighting levels fall below a predetermined level.
A solid-state photosensitive electron device whose current-voltage characteristic is a function of incident radiation.
A light-controlled variable resistor which has a light-to-dark resistance ratio of 1:1000.
a transducer used to detect and measure light and other radiations
a device that uses the photoelectric effect to convert energy from sunlight into electrical energy
a sensored compensator that measures and adjusts the illumination levels to a preset level in a designated area
a sensor (or transducer) that converts light (optical energy) into electrical energy
a "VARIABLE RESISTOR" whose resistance changes with the amount of light that hits it's surface
A device that measures the amount of incident light present in a space.
switch that is opened or closed by the action of a photoelectric cell.
A device that converts light to electrical current. Based on the amount of incident light, a photocell can switch a lamp on or off or regulate a lamp's light output to maintain a preset level of light.
An light sensing device used to control the electrical power distributed to luminaires in response to detected ambient light levels.
Automatically switches on the infra-red lights when light levels fall to a preset level.
A device that changes resistance when light falls on it. Similar to a light dependent resistor or LDR. This cell does not produce an output current - see Solar cell for output current.
A device that changes resistance with light.
A light sensing device used to control luminaries and dimmers in response to detected light levels.
See also Beam, Cell. Infrared devices that collect data from the course or track, sending instantaneous impulses to the timers. Click
a resistive, bulk effect type of photosensor, the type used when it is desirable to wire several photoreceivers in series or in parallel. The resistance decreases with increasing light intensity.
A resistive photosensitive device in which the resistance varies in inverse proportion to the amount of incident light.
