Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 
896 posts

Ultimate Geek

Subscriber

  #2532823 1-Aug-2020 17:44
Send private message quote this post

I have had it on jobs especially where the circuit is switched in multiple positions for the LED lamp to glow - as I said earlier a load correction device fixes this


23454 posts

Uber Geek

Trusted
Subscriber

  #2532837 1-Aug-2020 19:16
Send private message quote this post

Rikkitic:

 

It is not. The glowing in this case is a bug, not a feature. It doesn't happen with other bulb types, only LED. It looks to be an induction effect.

 

 

Capacitive, not induction.

 

If you have the sensor connected by 3 core wire then there is often enough capacitance between the wires to cause this to happen on cheap LED lamps, and some more expensive ones too.

 

Or if they put a capacitor across the output of the motion sensor to supress interference when the contacts arc at turn off, that will pass enough current too.

 

Swapping one LED out for something with a real power supply in it, or putting a resitive or inductive load on the same output will solve it. A common thing with LED downlight swaps is to leave one of the old magnetic transformers connected so that there is a load that will drop the voltage down to below what the LEDs will light at, but not take appreciable power when switched on.





Richard rich.ms

 
 
 
 


neb

2569 posts

Uber Geek

Trusted
Lifetime subscriber

  #2533063 2-Aug-2020 13:36
Send private message quote this post

Rikkitic:

One is in a motion detector in a hallway. It switches on when someone gets up at night to use the bathroom. But it doesn’t switch completely off. Instead, it glows all the time and the glow is actually fairly bright.

 

 

Could they be using the LEDs as droppers to provide power to the motion-detector circuit? That's a clever (in the sense of pennypinching) design, but also means there's nothing you can do to fix it.

440 posts

Ultimate Geek


  #2533070 2-Aug-2020 13:51
Send private message quote this post

gregmcc:

 

sqishy:

 

If it has motion and a normal on/off wall switch sounds like your live is gong to the bulb from the switch and the wall switch is switching negative. Often the live on the bulb causes a low glow.

 

 

@sqishy - what is your electrical background? The above statement is very wrong, there is no "negative", there may be a neutral which should not be switched, but switching this instead of the phase would not cause this to happen.

 

 

 

BTW 30+ years in the electrical industry, registered Electrical Inspector so I think I have a good background to give advice here that can be relied upon.

 

 

I question your back ground, negative is an old term for neutral. On LED lights many old house some dodgy people ran power and switched neutral. This sometimes causes leakage and the LEDs would flash or come on. I'm surprised you don't know this.


1821 posts

Uber Geek

Trusted
Lifetime subscriber

  #2533138 2-Aug-2020 15:34
Send private message quote this post

sqishy:

 

 

 

 

 

I question your back ground, negative is an old term for neutral. On LED lights many old house some dodgy people ran power and switched neutral. This sometimes causes leakage and the LEDs would flash or come on. I'm surprised you don't know this.

 

 

@sqishy - Question away, I don't mind people asking further questions about my electrical background, so what is your question? Oh please let me and others following this what your electrical background is.

 

Negative refers to the (-) side of a DC power supply, this whole thread revolves around a motion sensor that takes a standard 230VAC light bulb, in this case an LED one.

 

Negative has *never* been a term for neutral.

 

I did notice that you made some comments on another topic regarding hot water elements, with advice that failed to include other factors which if followed could have easily resulted in a fire, I did advise the OP to ignore your advice. As far as " dodgy people ran power and switched neutral" switching the phase or neutral in this case would make no difference, it is simply the long run on cable between the switch and the bulb and induced currents that causes the LED bulb to glow or flicker, without more details I would not think that this is the case.

 

 


1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic




News »

Freeview On Demand app launches on Sony Android TVs
Posted 6-Aug-2020 13:35


UFB hits more than one million connections
Posted 6-Aug-2020 09:42


D-Link A/NZ extends COVR Wi-Fi EasyMesh System series with new three-pack
Posted 4-Aug-2020 15:01


New Zealand software Rfider tracks coffee from Colombia all the way to New Zealand businesses
Posted 3-Aug-2020 10:35


Logitech G launches Pro X Wireless gaming headset
Posted 3-Aug-2020 10:21


Sony Alpha 7S III provides supreme imaging performance
Posted 3-Aug-2020 10:11


Sony introduces first CFexpress Type A memory card
Posted 3-Aug-2020 10:05


Marsello acquires Goody consolidating online and in-store marketing position
Posted 30-Jul-2020 16:26


Fonterra first major customer for Microsoft's New Zealand datacentre
Posted 30-Jul-2020 08:07


Everything we learnt at the IBM Cloud Forum 2020
Posted 29-Jul-2020 14:45


Dropbox launches native HelloSign workflow and data residency in Australia
Posted 29-Jul-2020 12:48


Spark launches 5G in Palmerston North
Posted 29-Jul-2020 09:50


Lenovo brings speed and smarter features to new 5G mobile gaming phone
Posted 28-Jul-2020 22:00


Withings raises $60 million to enable bridge between patients and healthcare
Posted 28-Jul-2020 21:51


QNAP integrates Catalyst Cloud Object Storage into Hybrid Backup solution
Posted 28-Jul-2020 21:40



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.