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2. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   Since most common power supplies are (nearly) constant-voltage sources, LED fixtures must include a power converter, or at least a current-limiting resistor. In some applications, the internal resistance of small batteries is sufficient to keep current within the LED rating. [citation needed] LEDs are sensitive to voltage.

3. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Low drop-out (LDO) constant current regulators also allow the total LED voltage to be a higher fraction of the power supply voltage. Switched-mode power supplies (e.g. buck, boost, and buck-boost converters) are used in LED flashlights and household LED lamps. Power MOSFETs are typically used for switching LED drivers, which is an efficient ...

4. 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 ...

5. Power supply unit (computer) - Wikipedia

   en.wikipedia.org/wiki/Power_supply_unit_(computer)

   A power supply unit ... of the ATX12V power supply specifications, [8] but led to a distinction in modern ATX power supplies between single ... White P9.3: −5 V Red ...

6. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   In 2012, Cree announced a white LED giving 254 lm/W, [10] and 303 lm/W in March 2014. [11] Practical general lighting needs high-power LEDs, of one watt or more. Typical operating currents for such devices begin at 350 mA.

7. Huge storms are coming this week: Here are 12 things to ... - AOL

   www.aol.com/lifestyle/here-are-12-things-to-have...

   It also has an LED flashlight on the side and three sources (hand crank, solar panel and built-in rechargeable battery) to power it. Plus, it's easy to carry and transport at just 0.5 pounds.