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Why Does The Led Light Become Darker And Darker When Used?

Jul. 27, 2020

LED lights become darker as they are used because LED lights have light decay. The light decay of LED lamp products is the weakening of the light signal during transmission. At this stage, LED products made by major global LED manufacturers have different degrees of light decay. High-power LEDs also have luminous decay, which is directly related to temperature. It is determined by the chip, phosphor and packaging technology. At present, the light decay of white LEDs on the market is one of the most important issues in the march to civil lighting.


Light decay generally refers to its luminous flux. When the surface of the photosensitive drum is charged, as the charge accumulates on the surface of the photosensitive drum, the potential continues to rise, and finally reaches the "saturation" potential, which is the highest potential. The surface potential will decrease over time. Generally, the working potential is lower than this potential. This process of natural decrease in potential over time is called the "dark decay" process. When the photosensitive drum is scanned and exposed, the dark area (referring to the surface of the photoconductor not irradiated by light) is still in the dark decay process; the bright area (referring to the surface of the photoconductor of the light irradiated part) the carrier density in the photoconductive layer increases rapidly. The conductivity rises rapidly, forming a photoconductive voltage, the charge quickly disappears, and the surface potential of the photoconductor also drops rapidly. Call it "light decay".

LED T Bulb

LED T Bulb

It is a very common phenomenon that Energy Saving Led Lamp become darker as they are used. In addition to light decay, Energy Saving Led Lamp Manufacturer summarized several other reasons that can make LED lamps dim, but the following three points.


1. The drive is damaged


Environmentally Friendly Led Lights require low DC voltage (below 20V), but our usual commercial power is AC high voltage (AC 220V). To turn the mains electricity into the electricity needed by the lamp beads, a device called "LED constant current drive power supply" is needed.


In theory, as long as the driver's parameters match the lamp bead board, it can be continuously powered and used normally. The internal part of the driver is more complicated, any device (such as capacitor, rectifier, etc.) failure may cause the output voltage to change, and then cause the lamp to dim. Driver damage is the most common type of failure in LED lamps, and usually can be resolved after replacing the driver.


2. LED burned out


The LED itself is a combination of lamp beads one by one, if one or part of them is not bright, it will inevitably make the whole lamp dim. Lamp beads are generally connected in series and then in parallel-so if one lamp bead burns out, a batch of lamp beads may not light up.


There are obvious black spots on the surface of the burnt lamp bead, find it, connect a wire to the back of it, and short-circuit it; or replace the lamp bead with a new one to solve the problem.

The LED burns out occasionally, it may happen by chance. If it burns frequently, you must consider the driver problem-another manifestation of driver failure is burning the lamp beads.


3. LED light decay


The so-called light decay means that the brightness of the luminous body is getting lower and lower-this situation is more obvious in incandescent and fluorescent lamps.


LED lights can't avoid light decay, but its light decay speed is relatively slow, and it is generally difficult to see changes with the naked eye. However, it is not ruled out that poor-quality LEDs, poor-quality light bead plates, or objective factors such as poor heat dissipation, resulting in faster LED light decay.


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