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2. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   Their luminous efficacies compared to normal LEDs depend on the spectral distribution of the resultant light output and the original wavelength of the LED itself. For example, the luminous efficacy of a typical YAG yellow phosphor based white LED ranges from 3 to 5 times the luminous efficacy of the original blue LED because of the human eye's ...

3. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   The materials used for the LED have a direct band gap with energies corresponding to near-infrared, visible, or near-ultraviolet light. LED development began with infrared and red devices made with gallium arsenide. Advances in materials science have enabled making devices with ever-shorter wavelengths, emitting light in a variety of colors.

4. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

5. Superluminescent diode - Wikipedia

   en.wikipedia.org/wiki/Superluminescent_diode

   A superluminescent diode (SLED or SLD) is an edge-emitting semiconductor light source based on superluminescence.It combines the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes.

6. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.

7. Want strong, healthy hair? Dermatologist talks rice water's ...

   www.aol.com/want-strong-healthy-hair...

   This has led many to turn to an ancient beauty secret. Rice water has been used for centuries in various countries, particularly in Asia, to promote healthy and smooth hair. The nutrient-rich ...