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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

   There is also the "common" scale, where women's sizes are equal to men's sizes plus 1 + 1 ⁄ 2. Children's shoes start from size zero, which is equivalent to 3 + 11 ⁄ 12 inches (11 + 3 ⁄ 4 barleycorns = 99.48 mm), and end at 13 + 1 ⁄ 2. Thus the formula for children's sizes in the US is child shoe size (barleycorns) = 3 × last length ...

4. Lumen (unit) - Wikipedia

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

   In equation form, 1 lx = 1 lm/m 2. A source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555 nm, in the green region of the optical spectrum) has luminous flux of 683 lumens. So a lumen represents at least 1/683 watts of visible light power, depending on the spectral distribution.

5. Luminous efficiency function - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficiency_function

   [c 1] The photopic includes the CIE 1931 standard [c 2] (solid), the Judd–Vos 1978 modified data [c 3] (dashed), and the Sharpe, Stockman, Jagla & Jägle 2005 data [c 4] (dotted). The horizontal axis is wavelength in nm. A luminous efficiency function or luminosity function represents the average spectral sensitivity of human visual ...