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“A slow cycling light does not give a motorist the right to run a red light,” said Modesto Police Department spokeswoman Sharon Bear in an email to The Modesto Bee.
The spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating. The spectral lines from the mercury emission and the phosphorescence effect give a combined spectral distribution of light that is different from those produced by incandescent ...
When using ARCAL, it is strongly recommended that aircraft on final approach to the airfield issue a fresh lighting command, even if the lights are already on, especially if the lights were activated by another aircraft. This is so that the lighting does not turn off at a critical moment, such as when crossing the runway threshold.
Impressions of several natural phenomena and the principles of some optical toys have been attributed to persistence of vision. In 1768, Patrick D'Arcy recognised the effect in "the luminous ring that we see by turning a torch quickly, the fire wheels in the fireworks, the flattened spindle shape we see in a vibrating cord, the continuous circle we see in a cogwheel that turns with speed". [8]
The cause of the fire wasn't immediately known, but Santa Ana winds were to blame for extremely dangerous fire conditions across much of Southern California. Gusts over 50 mph were reported in the ...
Earlier in the night, bushes and fence at the top of the property burned, a sight vividly rendered in video, but fire crews showed up and doused the area. "We thought it was completely under ...
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 ...
A glow stick, also known as a light stick, chem light, light wand, light rod, and rave light, is a self-contained, short-term light-source. It consists of a translucent plastic tube containing isolated substances that, when combined, make light through chemiluminescence. The light cannot be turned off and can be used only once.