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2. Light-up shoes - Wikipedia

   en.wikipedia.org/wiki/Light-up_shoes

   A typical light-up shoe for adults, where the LED ribbon is inside a translucent sole. Light-up shoes or LED shoes are footwear that have built-in light-emitting diodes, usually in the sole of the shoe. These specialized shoes may be used at parties, festivals, raves and to increase visibility. [1] Light-up shoes first became available in 1992.

3. Shoe size - Wikipedia

   en.wikipedia.org/wiki/Shoe_size

   The Mondopoint shoe length system is widely used in the sports industry to size athletic shoes, ski boots, skates, and pointe ballet shoes; it was also adopted as the primary shoe sizing system in the Soviet Union, [18] Russia, [19] East Germany, China, [20] Japan, Taiwan, and South Korea, and as an optional system in the United Kingdom, [21 ...

4. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   This produced a commercially packaged white light giving 65 lm/W at 20 mA, becoming the brightest white LED commercially available at the time, and more than four times as efficient as standard incandescents. In 2006, they demonstrated a prototype with a record white LED luminous efficacy of 131 lm/W at 20 mA.

5. Luminous efficiency function - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficiency_function

   The standard luminous efficiency function is normalized to a peak value of unity at 555 nm (see luminous coefficient). The value of the constant in front of the integral is usually rounded off to 683 lm/W. The small excess fractional value comes from the slight mismatch between the definition of the lumen and the peak of the luminosity function.

6. Lumen (unit) - Wikipedia

   en.wikipedia.org/wiki/Lumen_(unit)

   The lumen (symbol: lm) is the unit of luminous flux, a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI). ). Luminous flux differs from power (radiant flux), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation