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The appearance of objects illuminated by that light may vary as the spectrum varies. This is the issue of color rendition, quite separate from color temperature. An orange or cyan object could appear with the wrong color and much darker as the LED or phosphor does not emit the wavelength it reflects.
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 ...
Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.
This density is the origin of the idiom to go over like a lead balloon. [26] [27] [d] Some rarer metals are denser: tungsten and gold are both at 19.3 g/cm 3, and osmium—the densest metal known—has a density of 22.59 g/cm 3, almost twice that of lead. [28] Lead is a very soft metal with a Mohs hardness of 1.5; it can be scratched with a ...
An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode, [1] [2] is a type of light-emitting diode (LED) in which the emissive electroluminescent layer is an organic compound film that emits light in response to an electric current.
LED TVs, in contrast to older LCDs, have LED backlighting, leading to modest improvements in the picture quality. A few years ago, this was a serious debate -- was it worth it to pay more for an ...