Analysis and solutions of fixture shimmer after turn off

- May 31, 2017-

LED lamps and lanterns due to energy saving, high brightness advantages have been rapid popularization. Many families use LED lamps and found that after the lights off the lights at night will be issued shimmer, sometimes rhythmic flicker. Ceiling lamps, downlights, spotlights and light belts have this phenomenon. Long-term off the lights after the light, will cause damage to light and light failure, reduce lamp life.

Lamps turn off the lights after the main reason is to turn off the lights after the lights live, LED chip is particularly sensitive to the current, even a wire, no current loop, in a variety of complex sensor state, there will still be a small amount of light. Specifically, the following situations:

1: switch control of the zero line, FireWire directly into the lamp.

This is the most common cause of light. Open control of the zero line, the lights are only cut off the power of the lamp circuit, FireWire and lamps are still connected, the light will be shimmer.

Solution: re-circuit connection, so that switch control FireWire.


2: switch with indicator light or with electronic switch

Many switches inside with light, if the lights after the lights on, there will be a current flow through the lamps.

Some lamps use electronic light, such as infrared switches, voice-activated light, and remote control switches. This type of switch can not be completely cut off the circuit. Will also cause the lights to turn off the lights.

Solution: Remove the switch indicator or switch the mechanical switch.


3: Double control switch wiring error

There are many ways to connect the dual control switch, if the electrical use of the following wiring method, it will turn off the light after the light.

Solution: in accordance with the zero line into the lights, control the way to re-wiring FireWire, as shown below

4: zero line live.

If you solve the above problems, the lights still turn off the lights at night, we must consider the zero line charged. Theoretically, as long as the switch off the FireWire, the lights on the zero line above there will be no voltage, it can not form the induced current. In real life, zero line charging is very common. Such as zero line is not good, the line is too long, fine line, or zero line current is too large, will cause zero line charged

Solution: zero line charged personal difficult to solve, unless the transmission line transformation. So that the lamps do not touch the conductor, such as walls, roof, and steel keel, etc., can also reduce the luminous phenomenon. But can not be completely resolved.

5: There is an ultimate solution, that is, with the lamp protector.

 its principle is actually very simple, that is, through a self-controlled dual relay, direct cut off the connection between the lamp and power, completely off the zero line and FireWire. Put the protector into the lamp inside, as long as the lights, the output will disconnect the two lines. Even if the switch is wrong, zero line charged, it will not be transmitted to the lamp above. To avoid the lights off the lights, you can improve the indoor light environment, reduce the lamp bead failure, to extend the service life.

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