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2. Electrical outlet tester - Wikipedia

   en.wikipedia.org/wiki/Electrical_outlet_tester

   A receptacle tester being used to check for some types of improper wiring of an outlet. For this particular tester, proper wiring is indicated by the two yellow lights. The outlet tester checks that each contact in the outlet appears to be connected to the correct wire in the building's electrical wiring. It can identify several common wiring ...

3. Stack light - Wikipedia

   en.wikipedia.org/wiki/Stack_light

   Stack light in automated production for in-line quality inspection. Stack lights (also known as signal tower lights, indicator lights, andon lights, warning lights, industrial signal lights, or tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians ...

4. Indicator lamp - Wikipedia

   en.wikipedia.org/wiki/Indicator_lamp

   An indicator lamp (or indicator light) is an illuminated device that is intended to visually convey a single status to the user of a piece of equipment. Indicator lamp may refer to: Check engine light, a tell-tale warning light in automobiles; Tell-tale (automotive), a more generic class of indicators

5. Bright indicator lights ruining your sleep? You’re not alone ...

   www.aol.com/bright-indicator-lights-ruining...

   Those bright indicators are often LED lights. LED lighting is an energy-efficient option for manufacturing indicator lights. The light has a long lifespan and doesn’t generate excess heat ...

6. Neon lamp - Wikipedia

   en.wikipedia.org/wiki/Neon_lamp

   A General Electric NE-34 glow lamp, manufactured circa 1930. Neon was discovered in 1898 by William Ramsay and Morris Travers.The characteristic, brilliant red color that is emitted by gaseous neon when excited electrically was noted immediately; Travers later wrote, "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget."

7. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Sub-mA indicators may be made by driving ultra-bright LEDs at very low current. Efficiency tends to reduce at low currents, [3] but indicators running on 100 μA are still practical. In coin cell powered keyring-type LED lights, the resistance of the cell itself is usually the only current limiting device.