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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]
In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.
The pendant light at Fire Station #6 in which the bulb is installed. The Centennial Light was originally a 60-watt bulb, but has since dimmed significantly and is now as bright as a 4-watt bulb. [7] [8] [9] The hand-blown, carbon-filament common light bulb was invented by Adolphe Chaillet, a French engineer who filed a patent for this socket ...
The requirements of a flicker measurement equipment are defined in the international electro-technical standard IEC 61000-4-15. [2]A flickermeter is composed of several function blocks which simulate a 230 V/60 W or a 120 V/60 W incandescent lamp (reference lamp) and the human perception system (eye-brain model).
The original twinkle bulbs were C7½ and some C9¼ incandescent light bulbs with a bimetallic strip. Once the bulb warms up, the strip pulls slightly away from the contact, opening and interrupting the parallel circuit through the bulb and turning it off. The bulb then cools, allowing the strip to bend back and make contact again.
A flicker light bulb, flicker flame light bulb or flicker glow lamp is a gas-discharge lamp which produces light by ionizing a gas, usually neon mixed with helium and a small amount of nitrogen gas, by an electric current passing through two flame shaped electrode screens coated with partially decomposed barium azide. The ionized gas moves ...
Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz and this flickering can cause problems for some individuals with light sensitivity; [69] they are listed as problematic for some individuals with autism, epilepsy, [70] lupus, [71] chronic fatigue syndrome, Lyme disease, [72] and vertigo.
The yellow trap occurs when the timing of the amber lights (also known as "yellow" lights in the USA) is asymmetric for two-way traffic on a single road: when a vehicle is waiting to turn across oncoming traffic and receives an amber light from the traffic signal, the driver may assume that oncoming traffic also has received an amber light and ...