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  2. Bardic lamp - Wikipedia

    en.wikipedia.org/wiki/Bardic_lamp

    The Bardic Rail Signalling Lamp was the original name of a particular type of battery powered railway signalling handlamp made from 1962 by Bardic, Ltd. [1] for use by rail and trackside workers. It became the standard battery operated handlamp in use on British Rail , replacing oil-lit lamps.

  3. FCC investigating Amazon for reportedly selling illegal radio ...

    www.aol.com/finance/fcc-investigating-amazon...

    Equipment used to jam radio frequencies has long been banned by the Federal Communications Commission for public use and sale. The FCC now appears poised to investigate companies, including Amazon ...

  4. LED lamp - Wikipedia

    en.wikipedia.org/wiki/LED_lamp

    A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

  5. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    Electric signal lamps are typically low power (35 watt) incandescent lamps running off of low voltage DC current or, more recently, high output LED arrays. Incandescent signals use a doublet lens combination to directionally focus their small power out over a long range (3,500 ft or 1,100 m in daylight.)

  6. Outlawed anti-drone radio jammers are being marketed on ... - AOL

    www.aol.com/news/anti-drone-companies-market...

    Several online retailers and drone technology companies are marketing the sale of radio frequency jammers as drone deterrence or privacy tools, sidestepping federal laws that prohibit such devices ...

  7. Stack light - Wikipedia

    en.wikipedia.org/wiki/Stack_light

    Stack light in automated production for in-line quality inspection. Stack lights (also known as signal tower lights, indicator lights, andon lights, warning lights, industrial signal lights, or tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians ...

  8. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    As illustrated by a straight line on the chromaticity diagram, simple two-white blends will have a pink bias, becoming most severe in the middle. A small amount of green light, provided by another LED, could correct the problem. [38] Some products are RGBWW, i.e. RGBW with tunable white. [39] A final class of white LED with mixed light is dim ...

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