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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.
The term brownout comes from the dimming of incandescent lighting when voltage reduces. In some countries, the term brownout refers not to a drop in voltage but to an intentional or unintentional power outage (or blackout). [4] [5] [6]
[3] [4] The practice was initially very rare and was repeated only twice in the following quarter-century: for Oscar Hammerstein II in 1960 (involving the dimming of marquee lights, which became the standard practice) and Alfred Lunt in 1977. [4] However, by the 21st century, it became a relatively common form of tribute, occurring multiple ...
To help you sleep even better at night, Harris suggests dimming lights one hour before your desired bedtime; limiting caffeine within eight hours of bedtime; and limiting large meals, alcohol ...
It can be incorporated into an existing fluorescent light fixture or mounted remotely outside of it. When power is lost, the ballast will illuminate one or more lamps in the fixture at a reduced output for a minimum of 90 minutes (as required by code). These can be used as an alternative to egress lighting powered by a back-up electrical generator.
Dimming fluorescent ballasts and dimming LED drivers often use 0–10 V control signals to control dimming functions. In many cases, the dimming range of the power supply or ballast is limited. If the light output can only be dimmed from 100% down to 10%, there must be a switch or relay available to kill power to the system and turn the light ...
A street lamp mounted on a bracket and column A high pressure sodium street light fixture. Street light interference, sometimes called high voltage syndrome, is the claimed ability of individuals to turn street lights or outside building security lights on or off when passing near them. [1]
Compared to a rheostat-based circuit, the use of a thyristor greatly increases efficiency, as far less waste heat is generated. Dimming lights with a solid state dimmer also reduces total power draw, unlike rheostat dimmers. Spira's design (and most modern dimmers) rely on the use of AC power, and on the characteristics of incandescent lights.