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2. Ellipsoidal reflector spotlight - Wikipedia

   en.wikipedia.org/.../Ellipsoidal_reflector_spotlight

   A Colortran ERS. An Ellipsoidal Reflector from a Leko Source Four ERS. Ellipsoidal reflector spot (abbreviated to ERS, or colloquially ellipsoidal or ellipse) is the name for a type of stage lighting instrument, named for the ellipsoidal reflector used to collect and direct the light through a barrel that contains a lens or lens train.

3. Edison screw - Wikipedia

   en.wikipedia.org/wiki/Edison_screw

   E14 or E17 are also sometimes used, especially in small table lamps and novelty lighting, and occasionally the lights on newer ceiling fans. 'Christmas lights' use several base sizes: E17 for C9 bulbs, E12 for C7 bulbs, E10 for decades-old series-wired C6 bulb sets [19] in the U.S., and an entirely different wedge base for T1¾ mini-lights. For ...

4. Spotlight (theatre lighting) - Wikipedia

   en.wikipedia.org/wiki/Spotlight_(theatre_lighting)

   Characteristics of a typical spotlight include: A strong light source, often a high-intensity discharge lamp with a high colour temperature. A lens which can be manually focused. A manual device to change the intensity of the beam, especially when an HID source which can not be electronically dimmed, is used.