If you plug it it in, if it doesn't light it's the wrong way round.
Although these other two are more 'conventional':
-The negative wire is closest to a small flat 'spot' on the LED's base.
-The longer leg is the positive wire
The LED light spectrum is important in determining the quality of light emitted by LED lights because it affects the color rendering, brightness, and energy efficiency of the light. Different LED light spectrums can produce different colors of light, affect how well colors appear under the light, and impact the overall visual experience. By understanding and controlling the LED light spectrum, manufacturers can create LED lights that meet specific lighting needs and preferences.
Usable light can be produced from electricity by passing an electric current through a light bulb or LED, using electroluminescent materials that emit light when activated by electricity, or employing fluorescent tubes that contain gases that emit light when energized by electricity.
Powering electronic devices such as TVs, computers, and phones. Heating elements in appliances like stoves, ovens, and hair dryers. Providing light through light bulbs and LED fixtures.
The specific wavelength of blue LED light is typically around 450-470 nanometers.
A lamp uses electrical energy from the wall to power a filament or LED, which then produces light energy. The filament or LED converts the electrical energy into radiant energy, which is seen as visible light that brightens the room.
On an LED, one leg will be shorter than the other. The shorter leg is the negative polarity.
Why nothing at all, of course there will be no light.LEDs being diodes are polarity sensitive devices, which means they will only conduct electricity in one direction. Only when an LED conducts will it emit light.
From what I can tell, it does not appear to have an LED notification light.
Most LEDs have one lead longer than the other, or a flat side on the rim of the base, to indicate polarity. An LED that has neither of these must be marked in some other way. The only way to identify the polarity of an unmarked LED is to test it. A common AA or C battery in series with a small resistor of 50-100 ohms will do the job. The LED lights when the positive end of the battery ... possibly through the resistor ... goes to the positive end of the LED. (There is no harm to the LED when the battery is connected backwards and the LED doesn't light.)
3 ways, each pixel is made up of 3 LED (Light Emitting Diode) each a different color, red, green, and blue, that is if you were asking in reference to a LED flat panel TV! !
You can tell if your webcam has been hacked if its LED light blinks randomly.
LED often has brighter colors, the white color on an LCD is usually yellow-ish.
led in wrong ways
That would be an LED or Light Emitting Diode an LED is a light
Light Emitting Diode - LED
its not printed. polarity is indicated either by length (but this is lost after installation and trimming) or by a flat side on the LED package, or both
Reversing polarity will most likely damage electronic equipment, especially semiconductor components such as transistors, diodes and LED devices if the voltage is high enough. Other devices may not function at all, will be unaffected (such as incandescent light bulbs), or may work backwards (such as some DC motors.