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2. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   Today, porcelain standoffs are still commonly used with bare-wire electric fencing for livestock, and such porcelain standoffs carry far higher voltage surges without risk of shorting to ground. In summary, K&T wiring that was installed correctly, and not damaged or incorrectly modified since then, is fairly safe when used within the original ...

3. Light fixture - Wikipedia

   en.wikipedia.org/wiki/Light_fixture

   A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.

4. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   In larger lighting systems, for example warehouses or outdoor lighting systems, the required current may be too high for a manual switch. In these systems light switches control lighting contactors, a relay that allows the manual light switch to operate on a lower current, with smaller wiring than would be required in the main lighting circuit.

5. List of light sculptures by Dan Flavin - Wikipedia

   en.wikipedia.org/wiki/List_of_light_sculptures...

   Tin can, porcelain receptacle, pull chain, Aerolux bulb black glass beads 11 3/8 (30 cm) height, 4 1/2 in (11.5 cm) diameter 10 8 9 [10] Barbara Roses: 1962-1965 White glazed terracotta flower pot, porcelain light fixture with pull chain containing an Aerolux Flowerlite light bulb 8 1/4 × 4 3/4 × 4 3/4 in (20.95 × 12.06 × 12.06 cm) 10 10

6. Your Grow Light Is Probably Too Far from Your Plants—Here's ...

   www.aol.com/grow-light-probably-too-far...

   As the plants grow taller, you'll need to adjust the fluorescent light fixture to remain at the right height above the plants. Related: The 13 Best Light Bulbs To Illuminate Your Home LED Lights

7. Lighting - Wikipedia

   en.wikipedia.org/wiki/Lighting

   An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the ...