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2. Sodium-vapor lamp - Wikipedia

   en.wikipedia.org/wiki/Sodium-vapor_lamp

   Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night. Single ended self-starting lamps are insulated with a mica disc and contained in a borosilicate glass gas discharge tube (arc tube) and a metal cap. [3] [4] They include the sodium-vapor lamp that is the gas-discharge lamp in street lighting. [5 ...

3. Gas-discharge lamp - Wikipedia

   en.wikipedia.org/wiki/Gas-discharge_lamp

   Compared to other lamp types, relatively high arc power exists for the arc length. Examples of HID lamps include mercury-vapor lamps, metal halide lamps, ceramic discharge metal halide lamps, sodium vapor lamps and xenon arc lamps. HID lamps are typically used when high levels of light and energy efficiency are desired.

4. Sodium-vapour lamp - Wikipedia

   en.wikipedia.org/?title=Sodium-vapour_lamp&...

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5. Metal-halide lamp - Wikipedia

   en.wikipedia.org/wiki/Metal-halide_lamp

   Once the arc tube reaches its running temperature, the sodium dissociates from the iodine, adding orange and reds to the lamp's spectrum from the sodium D line as the metal ionizes. As a result, metal-halide lamps have high luminous efficacy of around 75–100 lumens per watt, [ 2 ] which is about twice that of mercury vapor lights and 3 to 5 ...

6. Color temperature - Wikipedia

   en.wikipedia.org/wiki/Color_temperature

   The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source. The color temperature scale describes only the color of light emitted by a light source, which may actually be at a different (and often much lower) temperature. [1] [2]

7. A Series of Killings Was Pinned on a Mystery Woman ... - AOL

   www.aol.com/series-killings-pinned-mystery-woman...

   In one of the country's most "embarrassing" cases, German police spent years tracking down a killer only to turn the investigation back on themselves