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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. LA Gear - Wikipedia

   en.wikipedia.org/wiki/LA_Gear

   Regulator: The inflatable shoe craze of the early 1990s spawned this shoe, LA Gear's answer to the Reebok Pump. [20] [21] The shoe featured a large pumping button on the tongue (larger than the Reebok Pump's) and a switch on top that deflated the shoe when pushed to the right. [22] LA Lights: One of LA Gear's most successful lines, which came ...

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. 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.

6. Luminous flux - Wikipedia

   en.wikipedia.org/wiki/Luminous_flux

   Table of comparative luminous flux of several light sources [7] [8] [9] Source Luminous flux (lumens) 37 mW "Superbright" white LED: 0.20 15 mW green laser (532 nm wavelength) 8.4 1 W high-output white LED: 25–120 Kerosene lantern: 100 40 W incandescent lamp at 230 volts: 325 7 W high-output white LED: 450 6 W COB filament LED lamp: 600 18 W ...

7. Lux - Wikipedia

   en.wikipedia.org/wiki/Lux

   The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). [1] [2] It is equal to one lumen per square metre.In photometry, this is used as a measure of the irradiance, as perceived by the spectrally unequally responding human eye, of light that hits or passes through a surface.