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  2. High-intensity discharge lamp - Wikipedia

    en.wikipedia.org/wiki/High-intensity_discharge_lamp

    HID lamps produce different colors of light primarily through the use of various metal additives in the lamp's arc tube and the physics of the gas discharge process. [11] Metal Additives: HID lamps contain an arc tube filled with a mixture of gases, including a noble gas (like xenon). These metal additives are crucial for producing different ...

  3. Headlamp (outdoor) - Wikipedia

    en.wikipedia.org/wiki/Headlamp_(outdoor)

    Headlamp attached to a helmet. A headlamp, headlight, or head torch is a light source affixed to the head typically for outdoor activities at night or in dark conditions such as caving, orienteering, hiking, skiing, backpacking, camping, mountaineering or mountain biking. Headlamps may also be used in adventure races.

  4. Hydrargyrum quartz iodide - Wikipedia

    en.wikipedia.org/wiki/Hydrargyrum_quartz_iodide

    Like all HID lamps, HQI lamps operate under high pressure and temperature, and require special light fixtures for safe use. HQI lamps can produce different color temperatures when manufactured with different metal halides. They are relatively efficient light sources producing a high lumen per watt ratio (approximately 6x that of incandescent ...

  5. Metal-halide lamp - Wikipedia

    en.wikipedia.org/wiki/Metal-halide_lamp

    It is a type of high-intensity discharge (HID) gas discharge lamp. [1] Developed in the 1960s, they are similar to mercury vapor lamps, [1] but contain additional metal halide compounds in the quartz arc tube, which improve the efficiency and color rendition of the light. The most common metal halide compound used is sodium iodide. Once the arc ...

  6. Headlamp - Wikipedia

    en.wikipedia.org/wiki/Headlamp

    HID projector low beam headlamp illuminated on a Lincoln MKS. High-intensity discharge lamps (HID) produce light with an electric arc rather than a glowing filament. The high intensity of the arc comes from metallic salts that are vaporized within the arc chamber. These lamps have a higher efficacy than tungsten lamps.

  7. Safety lamp - Wikipedia

    en.wikipedia.org/wiki/Safety_lamp

    The light given out by these lamps was poor (particularly Davy's, obscured by the gauze); early lamps gave less light than candles. [23] This was not resolved until the introduction of electric lighting around 1900, and the introduction of battery-powered helmet lamps in 1930.