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  2. Holiday lighting technology - Wikipedia

    en.wikipedia.org/wiki/Holiday_lighting_technology

    All miniature bulbs, including some LED sets, have a wedge base, though their designs are inconsistent with one another, making it somewhat difficult for the average consumer to change bulbs. To replace a bulb, the plastic base of the bulb must usually be changed by straightening the two wires and pulling the glass part out. Most replacement ...

  3. Safelight - Wikipedia

    en.wikipedia.org/wiki/Safelight

    A safelight usually consists of an ordinary light bulb in a housing closed off by a coloured filter, but sometimes a special light bulb or fluorescent tube with suitable filter material or phosphor (in fluorescent tubes) coated directly on the glass is used in an ordinary fixture. More recently LEDs, which have a relatively narrow spectral ...

  4. Phase-out of incandescent light bulbs - Wikipedia

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

    LED lamps radiate much less heat than other technologies, and can be either multi-directional or unidirectional, eliminating the need for a mirrored reflector in the bulb or fixture. [23] LED lamps can emit saturated colored light. Disadvantages include spectrum limitations due to discrete emission colors.

  5. Enlarger - Wikipedia

    en.wikipedia.org/wiki/Enlarger

    All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.

  6. Halogen lamp - Wikipedia

    en.wikipedia.org/wiki/Halogen_lamp

    The small size of halogen lamps permits their use in compact optical systems for projectors and illumination. The small glass envelope may be enclosed in a much larger outer glass bulb, which has a lower temperature, protects the inner bulb from contamination, and makes the bulb mechanically more similar to a conventional lamp. [1]

  7. Digital light processing - Wikipedia

    en.wikipedia.org/wiki/Digital_Light_Processing

    The lamp's end of life is typically indicated by an LED on the unit or an onscreen text warning, necessitating replacement of the lamp unit. Continued operation of the lamp past its rated lifespan may result in a further decrease in efficiency, the lightcast may become uneven, and the lamp may eventually become hot enough to the point that the ...

  8. Gobo (lighting) - Wikipedia

    en.wikipedia.org/wiki/Gobo_(lighting)

    The discolored portion is oxidation of the stainless steel caused by the high temperature of the lamp, but the gobo is still usable. A glass gobo of the Earth, projected using a halogen projector A gobo being projected with beams of smoke. Gobos are used with projectors and simpler light sources to create lighting scenes in theatrical applications.

  9. Mercury-vapor lamp - Wikipedia

    en.wikipedia.org/wiki/Mercury-vapor_lamp

    Typical mercury-vapor lamps with an outer envelope made of soda lime or borosilicate glass still allow a relatively large amount of 365 nm UV radiation to escape the lamp. This can cause the accelerated aging of some plastics used in the construction of luminaires, leaving them significantly discolored after only a few years' service.

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