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2. Emergency vehicle lighting - Wikipedia

   en.wikipedia.org/wiki/Emergency_vehicle_lighting

   The four bulb Beacon Ray Model 175 with a clear dome and colored lenses over the bulbs were used extensively in the 1960s by the NYPD with two red bulbs alternated with a white bulb and an amber bulb canted upwards at a 45-degree angle so the amber flash would reflect off upper-floor building windows for added traffic attention/visibility.

3. Navigation light - Wikipedia

   en.wikipedia.org/wiki/Navigation_light

   Navigation light. A navigation light, also known as a running or position light, is a source of illumination on a watercraft, aircraft or spacecraft, meant to give information on the craft's position, heading, or status. [ 1] Some navigation lights are colour-coded red and green to aid traffic control by identifying the craft's orientation.

4. Color temperature - Wikipedia

   en.wikipedia.org/wiki/Color_temperature

   An incandescent lamp's light is thermal radiation, and the bulb approximates an ideal black-body radiator, so its color temperature is essentially the temperature of the filament. Thus a relatively low temperature emits a dull red and a high temperature emits the almost white of the traditional incandescent light bulb.

5. Mercury-vapor lamp - Wikipedia

   en.wikipedia.org/wiki/Mercury-vapor_lamp

   A closeup of a 175- W mercury vapor lamp. The small diagonal cylinder at the bottom of the arc tube is a resistor which supplies current to the starter electrode. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light. [ 1] The arc discharge is generally confined to a small fused quartz ...

6. Phase-out of incandescent light bulbs - Wikipedia

   en.wikipedia.org/wiki/Phase-out_of_incandescent...

   Alternative light sources use phosphors or combinations of mono-chromatic LEDs (red, blue, and green) to produce "white" light, giving significantly irregular spectral distributions that can create color casts in photography and differences of color matching when compared to incandescent light or daylight.

7. Safelight - Wikipedia

   en.wikipedia.org/wiki/Safelight

   Fixed safelight in darkroom. An amber (light brown) safelight for use with certain black-and-white photographic papers. A safelight is a light source suitable for use in a photographic darkroom. It provides illumination only from parts of the visible spectrum to which the photographic material in use is nearly, or completely insensitive.