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2. Balanced-arm lamp - Wikipedia

   en.wikipedia.org/wiki/Balanced-arm_lamp

   Anglepoise model 1227 from 1935. A balanced-arm lamp, sometimes called a floating arm lamp, is a lamp with an adjustable folding arm which is constructed such that the force due to gravity is always counteracted by springs, regardless of the position of the arms of the lamp.

3. 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.

4. Anglepoise lamp - Wikipedia

   en.wikipedia.org/wiki/Anglepoise_lamp

   The lamps have been made from a variety of materials over the years, evolving from the early full steel prototypes into later models made from brass and aluminium. [14] Although the lamp is still marketed as an iconic British design, production for all lamps, except the 1227 Giant model, has been moved to China. [15]

5. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   As early as 1885 a two-pin plug and wall socket format was available on the British market. By about 1910 the first three-pin earthed (grounded) plugs appeared. Over time other safety improvements were gradually introduced to the market. The earliest national [clarification needed] standard for plug and wall socket forms was set in 1915.

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