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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. Naturalizer - Wikipedia

   en.wikipedia.org/wiki/Naturalizer

   Naturalizer may refer to: in mathematics, the naturalizer of an infranatural transformation; Naturalizer, a shoe brand of Caleres This page was last edited on 29 ...

4. Sneakers - Wikipedia

   en.wikipedia.org/wiki/Sneakers

   A pair of Nike Air Jordan 1 sneakers. Sneakers or trainers , also known by a wide variety of other names, are shoes primarily designed for sports or other forms of physical exercise but which are also widely used for everyday casual wear. They were popularized by companies such as Converse, Nike and Spalding in the mid 20th century. Like other ...

5. 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.

6. Luminous intensity - Wikipedia

   en.wikipedia.org/wiki/Luminous_intensity

   Luminous flux per unit solid angle per unit projected source area. The candela per square metre is sometimes called the nit. Illuminance: E v: lux (= lumen per square metre) lx (= lm/m 2) L −2 ⋅J: Luminous flux incident on a surface Luminous exitance, luminous emittance M v: lumen per square metre lm/m 2: L −2 ⋅J: Luminous flux emitted ...

7. Shoe size - Wikipedia

   en.wikipedia.org/wiki/Shoe_size

   child shoe size (barleycorns) = 3 × last length (in) − 11 3 ⁄ 4. equivalent to: child shoe size (barleycorns) ≈ 3 × foot length (in) − 9 3 ⁄ 4. Alternatively, a Mondopoint-based scale running from K4 to K13 and then 1 to 7 is in use. [12] K4 to K9 are toddler sizes, K10 to K13 are pre-school and 1 to 7 are grade school sizes.