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Downlights can be incandescent, fluorescent, HID (high intensity discharge) or LED. Track lighting , invented by Lightolier , [ 14 ] was popular at one period of time because it was much easier to install than recessed lighting, and individual fixtures are decorative and can be easily aimed at a wall .
A common dual dimmer module used in stage lighting A dimmer. A dimmer is a device connected to a light fixture and used to lower the brightness of the light.By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output.
A "transformer bank", widely used in North America: three single-phase transformers connected to make a 3-phase transformer. The low-voltage secondary windings are attached to three or four terminals on the transformer's side. In North American residences and small businesses, the secondary is often the split-phase 120/240-volt system. The 240 ...
These pull cords are part of a communication system where, when pulled, a light outside the bathroom flashes, which notifies a nurse or someone who is around to help the person in need. In addition to the flashing light, a buzzer or tone can be heard. Ideally, they are placed near the toilet or shower. [2]
In electrical distribution, a fuse cutout or cut-out fuse (often referred to as a cutout) is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads. An overcurrent caused by a fault in the transformer or customer circuit will cause the fuse to ...
Switch on time: LEDs light up extremely quickly. A typical red indicator LED achieves full brightness in under a microsecond. [71] LEDs used in communications devices can have even faster response times. Focus: The solid package of the LED can be designed to focus its light. Incandescent and fluorescent sources often require an external ...
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