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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.
The standard was published in October 2003, splitting off from ISO 3864:1984, which set out design standards and colors of safety signage and merging ISO 6309:1987, Fire protection - Safety signs to create a unique and distinct standard for safety symbols.
A fire extinguisher can be the difference between a minor house fire and the total loss of your home. However, a fire extinguisher is only as effective as its accessibility when disaster strikes.
Priority 5, 6, and 7 is a standard call. No lights or siren authorised and follow all traffic rules. The Department of Fire and Emergency Services have two response codes: [10] Fire Call is the response that authorises lights and sirens, and disobeying road laws within reason. This is the response for most calls, including bushfires and road ...
Green goo oozing from electrical sockets and flickering lights might not be a sign your house is haunted this Halloween - but rather a call is needed for an electrician, according to a campaign group.
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
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