enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Flameless candle - Wikipedia

   en.wikipedia.org/wiki/Flameless_candle

   Flameless candles display flickering light, imitating that of actual flames. As a decorative element, the design of a flameless candle is relatively versatile. The body or "housing" of the device is commonly cylindrical, containing a battery pack and an often flame-shaped LED lamp atop the candle. Many manufactures use LED lights with an ...

3. Thermal management of high-power LEDs - Wikipedia

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

   The LED filament style of lamp combines many relatively low-power LEDs on a transparent glass substrate, coated with phosphor, and then encapsulated in silicone. The lamp bulb is filled with inert gas, which convects heat away from the extended array of LEDs to the envelope of the bulb. This design avoids the requirement for a large heat sink.

4. Bardic lamp - Wikipedia

   en.wikipedia.org/wiki/Bardic_lamp

   3/4 front-left view of British Rail Bardic hand-lamp. The Bardic Rail Signalling Lamp was the original name of a particular type of battery powered railway signalling handlamp made from 1962 by Bardic, Ltd. [1] for use by rail and trackside workers. It became the standard battery operated handlamp in use on British Rail, replacing oil-lit lamps.

5. 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 ...

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. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Household LED light bulb with its internal LED elements and driver circuitry exposed. An active constant current source is commonly used for high power LEDs, stabilizing light output over a wide range of input voltages which might increase the useful life of batteries.

8. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   Close-up image of a surface-mount LED Close-up of an LED with the voltage being increased and decreased to show a detailed view of its operation A bulb-shaped modern retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage

9. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   If an LED lamp does not have free air circulation, the LED is likely to overheat, resulting in reduced life or early failure. The thermal design of the system must allow for the ambient temperature surrounding the lamp; a lamp in a freezer experiences a lower ambient than a lamp in a billboard in a sunny climate. [20]