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Full unboxing, setup, install, and detailed review/ demo of the WeMo smart dimmer switch by Belkin. Complete walkthrough from start to finish! Voltage detector tool: http://amzn.to/2scuiG0 WeMo smart dimmer: http://amzn.to/2rZYaFT
The effect is caused by capacitive coupling radiating tiny amounts of energy through the floating neutral side of the domestic wiring. The neutral is floating because it is a "switched neutral" configuration which has the physical switch in the open/disconnected position. The LED is connected to an ordinary mechanical switch but still glows even when it's supposed to be switched off. There is no dimmer or any other electronic devices attached to the circuit. The circuit used in the video is a dual switched circuit configuration, which is commonly found in hallways and stairwells in the UK. Multiple switched lighting circuits tend to have much longer wiring runs between the switches, which can make this effect more pronounced. Changing the position of the switches can also change the effective length of the floating side of the circuit and consequently changes the intensity of the glow. As demonstrated in the video, you need both a susceptible bulb as well as the circuit in question must be wired in a particular way, ie switched neutral. Best practice wiring is usually considered as "switched live" so the fitting is neutralized when switched off. Useful to a help avoid careless fingers receiving a zap when changing bulbs. The strobing effect of the 8 watt Bonlux filament LED means I find these unsuitable for use in my home but it does serve to demonstrate this aberration. Affiliate link to non-dimmable MiniSun BC 8w LED featured in video : http://goo.gl/SEop0k This video was created with the help of the YouTube Video Editor (http://www.youtube.com/editor)
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I've noticed that a few LED bulbs continue to glow slightly, flicker or flash even though the power switch is off. This video explains why this happens.
You can restore most bulbs to their default settings with this simple trick.
Overview of LED lightbulbs from GE, including how to choose brightness, color temperature, and power consumption, January 3, 2018.