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The Hue system was released in October 2012 on Apple Store, [3] and was marketed as the first iOS-controlled lighting appliance. [6] Products released before 2019 use the Zigbee Light Link protocol, a compatible subset of Zigbee 3.0, to communicate, while lighting products released later use either Bluetooth or Zigbee 3.0.
An occulting light is a rhythmic light in which the duration of light in each period is longer than the total duration of darkness. In other words, it is the opposite to a flashing light where the total duration of darkness is longer than the duration of light. It has the appearance of flashing off, rather than flashing on.
Flicker vertigo, sometimes called the Bucha effect, is "an imbalance in brain-cell activity caused by exposure to low-frequency flickering (or flashing) of a relatively bright light." [ 1 ] It is a disorientation -, vertigo -, and nausea -inducing effect of a strobe light flashing at 1 Hz to 20 Hz, approximately the frequency of human brainwaves .
The Abney effect or the purity-on-hue effect is the perceived hue shift that occurs when white light is added to a monochromatic light source. [ 1 ] [ 2 ] The addition of white light will cause a desaturation of the monochromatic source, as perceived by the human observer.
The map of the aurora forecast shows that northern parts of the country have a better chance of seeing the auroras. A view line that shows "the southern extent of where aurora might be seen on the ...
Internally triggered Strobotrons (light-output optimized thyratrons) were available [9] as well as flood-beam-CRT-type, grid-controlled Vacuum stroboscopic light sources with fast phosphors. [10] The strobe light was popularized on the club scene during the 1960s when it was used to reproduce and enhance the effects of LSD trips. Ken Kesey used ...
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.
Glow starters have a relatively short life, and light fittings enable the starter to be changed easily. Electronic starters, being interchangeable and using the same casing as a glow starter, last for many years. The glow switch starter was invented by E. C. Dench in 1938. [1]