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  2. Thermal management of high-power LEDs - Wikipedia

    en.wikipedia.org/wiki/Thermal_management_of_high...

    LED power dissipation is modeled as a current source; thermal resistance is modeled as a resistor; and the ambient temperature is modeled as a voltage source. High power light-emitting diodes (LEDs) can use 350 milliwatts or more in a single LED. Most of the electricity in an LED becomes heat rather than light (about 70% heat and 30% light). [1]

  3. Light-emitting diode physics - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode_physics

    A LED is a long-lived light source, but certain mechanisms can cause slow loss of efficiency of the device or sudden failure. The wavelength of the light emitted is a function of the band gap of the semiconductor material used; materials such as gallium arsenide , and others , with various trace doping elements , are used to produce different ...

  4. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    1 watt 9 volt three chips SMD phosphor based white LED. Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stokes shift loss.

  5. SMD LED - Wikipedia

    en.wikipedia.org/wiki/SMD_LED

    The light from white LED lamps and LED strip lights is usually provided by industry standard surface-mounted device LEDs (SMD LEDs). [2] Non-SMD types of LED lighting also exist, such as COB (chip on board) and MCOB (multi-COB). Surface-mounted device LED modules are described by the dimensions of the LED package. A single multicolor module may ...

  6. Inmate who killed Oklahoma girl says if execution could ... - AOL

    www.aol.com/inmate-killed-oklahoma-girl-says...

    Oklahoma death row inmate, Kevin Ray Underwood, 44, is set to be executed Thursday, 18 years after he killed 10-year-old neighbor Jamie Rose Bolin.

  7. Biden to cancel even more student debt, prioritize Ukraine ...

    www.aol.com/biden-cancel-even-more-student...

    Biden has already wiped away more than $175 billion in loans for millions of student borrowers, as part of a 2020 campaign promise to eliminate their debt.

  8. Man denies murder of asylum hotel worker - AOL

    www.aol.com/man-denies-murder-asylum-hotel...

    A man has denied murdering a woman who worked at the asylum hotel in which he was staying. Deng Chol Majek, 18, is accused of stabbing Rhiannon Skye Whyte at Bescot Stadium station in Walsall.

  9. High-CRI LED lighting - Wikipedia

    en.wikipedia.org/wiki/High-CRI_LED_lighting

    High-CRI LED lighting is a light-emitting diode (LED) lighting source that offers a high color rendering index (CRI). CRI is a quantitative measure of a light's ability to reproduce the colors of objects faithfully in comparison with an ideal or natural light source.

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