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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.
Flameless candles display flickering light, simulating real flames. As a decorative element, the design of a flameless candle is relatively versatile. The body or "housing" of the device is commonly cylindrical, containing a battery pack and an often flame-shaped LED lamp atop the candle. Many manufactures use LED lights with a sporadic ...
Temporal light artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect. Flicker is a directly visible light modulation at relatively low frequencies (< 80 Hz) and small intensity modulation levels.
New lighting systems have not used magnetic ballasts since the turn of the century, however some older installations still remain. Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle).
Retro-fit LED tubes (installation method 1 above) can also often be installed in fixtures designed for LED tubes. In these cases, the fixture typically only acts as a frame or holder to the tube, and electricity supply to the tubes uses the conductors in the fixture. The LED tube may also be compliant with standard EN 62776. LED tubes that are ...
A steam shower could be a regular shower with the added steam feature that is powered by a steam generator. In addition to plain steam, modern steam showers provide additional features such as foot massagers, ceiling rain showers, television, radios, telephones, audio input from an MP3 or CD player, chromatherapy or aromatherapy.