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  2. Magnesium torch - Wikipedia

    en.wikipedia.org/wiki/Magnesium_torch

    An underwater torch is available in the Education Edition of the Minecraft sandbox video game, created by combining a torch with magnesium on a crafting table. [7] Featured occasionally in the Sea Hunt television show. [8] Magnesium torches were used in the documentary series The Undersea World of Jacques Cousteau. "The Secrets of the Sunken ...

  3. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    A flashlight or electric torch (Commonwealth English), usually shortened to torch, is a portable hand-held electric lamp. Formerly, the light source typically was a miniature incandescent light bulb , but these have been displaced by light-emitting diodes (LEDs) since the early 2000s.

  4. Sodium-vapor lamp - Wikipedia

    en.wikipedia.org/wiki/Sodium-vapor_lamp

    When the lamp is first started, it emits a dim red/pink light to warm the sodium metal; within a few minutes as the sodium metal vaporizes, the emission becomes the common bright yellow. These lamps produce a virtually monochromatic light averaging a 589.3 nm wavelength (actually two dominant spectral lines very close together at 589.0 and 589. ...

  5. Water torch - Wikipedia

    en.wikipedia.org/wiki/Water_torch

    Water torch can mean: Water torch , an oxyhydrogen torch whose gas supply is generated immediately by electrolysis of water The water plant Typha latifolia , because its stems when soaked in oil make good burning torches

  6. Glow stick - Wikipedia

    en.wikipedia.org/wiki/Glow_stick

    Glow sticks are waterproof, do not use batteries, consume no oxygen, generate no or negligible heat, produce neither spark nor flame, can tolerate high pressures such as those found under water, are inexpensive, and are reasonably disposable.

  7. Carbide lamp - Wikipedia

    en.wikipedia.org/wiki/Carbide_lamp

    An acetylene gas powered lamp produces a bright, broad light. Many cavers prefer this type of unfocused light as it improves peripheral vision in the complete dark. The reaction of carbide with water is exothermic and produces a fair amount of heat independent of the flame.

  8. Arc lamp - Wikipedia

    en.wikipedia.org/wiki/Arc_lamp

    The Vortek water-wall plasma arc lamp, invented in 1975 by David Camm and Roy Nodwell at the University of British Columbia, Vancouver, Canada, made the Guinness Book of World Records in 1986 and 1993 as the most powerful continuously burning light source at over 300 kW or 1.2 million candle power.

  9. Ecological light pollution - Wikipedia

    en.wikipedia.org/wiki/Ecological_light_pollution

    Ecological light pollution [1] is the effect of artificial light on individual organisms and on the structure of ecosystems as a whole.. The effect that artificial light has upon organisms is highly variable, [2] and ranges from beneficial (e.g. increased ability for predator species to observe prey) to immediately fatal (e.g. moths that are attracted to incandescent lanterns and are killed by ...

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