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2. The 20 Best Cordless Lamps for Cozy, Portable Light - AOL

   www.aol.com/20-best-cordless-lamps-cozy...

   Seraph Cordless LED Table Lamp. ... Alternatively, it can be placed on the wall, creating a sconce with various light settings. Colors: White, olive, red. Dimensions: 2.4" H x 9" diameter.

3. 20 Cordless Lamps That Are Equally as Pretty as They Are ...

   www.aol.com/lifestyle/20-cordless-lamps-equally...

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4. Sconce (light fixture) - Wikipedia

   en.wikipedia.org/wiki/Sconce_(light_fixture)

   A sconce or wall light is a decorative light fixture that is mounted to a wall. [1] The sconce is a very old form of fixture, historically used with candles and oil lamps. They can provide general room lighting, and are common in hallways and corridors, but they may be mostly decorative. [1] A sconce may be a traditional torch, cresset, candle ...

5. Wall-plug efficiency - Wikipedia

   en.wikipedia.org/wiki/Wall-plug_efficiency

   In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into optical power. It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power.