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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details. |
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29th Jan 2019, 6:47 pm | #41 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
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Re: A Quick Question about Halogen to LED conversion
I don't really want to replace the whole installation.
Just the bulb - when it eventually fails! That's not unreasonable, is it?
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29th Jan 2019, 7:05 pm | #42 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
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Re: A Quick Question about Halogen to LED conversion
No need to replace the installation. In hindsight, if you'd attached the image in post 25 to post 1, things would have been easier. You just need an MR16 LED to replace the MR16 Halogen when it fails.
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29th Jan 2019, 7:30 pm | #43 |
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Re: A Quick Question about Halogen to LED conversion
Why not bypass the transformer and use a mains rated bulb?
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29th Jan 2019, 9:14 pm | #44 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
Posts: 729
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Re: A Quick Question about Halogen to LED conversion
Thanks, Bill.
I'll do that. It's been an interesting thread, though, hasn't it!
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30th Jan 2019, 2:08 am | #45 |
Heptode
Join Date: May 2009
Location: Birmingham, West Midlands, UK.
Posts: 708
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Re: A Quick Question about Halogen to LED conversion
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30th Jan 2019, 2:16 am | #46 |
Octode
Join Date: Oct 2011
Location: Wrexham, North Wales, UK.
Posts: 1,457
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Re: A Quick Question about Halogen to LED conversion
If Peter has no use for the tranny, please do send it this way, TDC make very good trannies.
Rick. |
2nd Feb 2019, 6:11 pm | #47 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
Posts: 729
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Re: A Quick Question about Halogen to LED conversion
I still haven't decided on a dichroic bulb for the downlighter outside, but I bought these (see pic) today as replacements for other 12 volt halogen capsule bulbs under the kitchen cupboards.
They haven't gone pop yet, but they must surely be getting near! They've been working for ten years. Will these ones I've bought be the right ones, do you think? Thanks for all thoughts
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Best Regards, Peter. Last edited by Lancs Lad; 2nd Feb 2019 at 6:37 pm. |
2nd Feb 2019, 7:04 pm | #48 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
Posts: 729
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Re: A Quick Question about Halogen to LED conversion
The undercupboard 20 watt, 12 volt halogen lights have suddenly stopped working, and, after changing the fuse in the FCU, I can only deduce that the GET electronic transformer has failed.
I've bought a set of those triangular/pyramid shaped, 240 volt LED downlighters as a replacement solution, but I'm loath to change them in case the light isn't as bright. I rely on really bright lighting to put my contact lenses in properly. Yes! I know it's a daft reason, but it is how it is. Should I keep the halogens and fit a new transformer? Or risk going with these new-fangled LEDs?
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Best Regards, Peter. |
3rd Feb 2019, 11:49 pm | #49 |
Heptode
Join Date: Oct 2012
Location: London, UK.
Posts: 500
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Re: A Quick Question about Halogen to LED conversion
There seems to be confusion here over terminology.
MR16 means multifaceted reflector 16 eights of an inch in diameter. It has nothing to do with the voltage or base of the lamp. Most 240v GU10 lamps are in fact MR16. Some LED lamps are the same size but don't have the multifaceted reflector. Manufacturers/sellers are to blame as they seem to refer to GU5.3 12v lamps as MR16 (which they are of course) but that is not the definition of MR16. Electronic transformer. No such thing but again blame the sellers for misdescribing a switch mode power supply. A transformer is a device which changes voltage or current using electromagnetic induction. Isolating transformers work the same way but do not change the voltage. |
4th Feb 2019, 10:47 am | #50 |
Rest in Peace
Join Date: Apr 2011
Location: Matlock, Derbyshire, UK.
Posts: 1,378
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Re: A Quick Question about Halogen to LED conversion
But a mains switch mode power supply is an electronic transformer. It contains electronics and a transformer.
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4th Feb 2019, 2:59 pm | #51 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: A Quick Question about Halogen to LED conversion
A mains SMPSU may or may not contain a transformer- it will need an energy storage device, usually but not necessarily an inductor. If the output is isolated from the mains there will almost certainly be a transformer though it could be done using a flying capacitor technique.
I'm not convinced that a "transformer" must use magnetic induction, isn't it literally just a device for transforming something from one form to another?
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4th Feb 2019, 8:46 pm | #52 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,643
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Re: A Quick Question about Halogen to LED conversion
If you Google MR16 it can have any base, and be any voltage, but in popular usage it's normally 2 pin 12 volt. Similarly the power converter is universally called an electronic transformer. Using any other name, except in present company perhaps, will likely get the response "oh you mean an electronic transformer"
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7th Feb 2019, 10:41 am | #53 |
Octode
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,118
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Re: A Quick Question about Halogen to LED conversion
'Transformer' in electronics industry jargon generally means a device with two or more coils, inductively linked.
In the tramway industry, a 'rotary' (more jargon) is a type of transformer. There's also some sort of kids' toy... |
7th Feb 2019, 11:04 am | #54 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
Posts: 729
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Re: A Quick Question about Halogen to LED conversion
This is the transformer for the kitchen cupboard lights.
I only called it 'electronic' because of the labelling! It's really lightweight - nothing like the heavy 'bricks' I've used previously. Do they generally just fail without warning? It's had fairly heavy use for at least ten years.
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7th Feb 2019, 12:23 pm | #55 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
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Re: A Quick Question about Halogen to LED conversion
I can't help thinking that titling the thread "a quick question" was rather tempting fate!
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7th Feb 2019, 1:21 pm | #56 |
Nonode
Join Date: Aug 2015
Location: Cambridge, Cambs. UK.
Posts: 2,198
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Re: A Quick Question about Halogen to LED conversion
.........it was only supposed to be about a lamp replacement............
How many vintage radio enthusiasts does it take to change a light bulb?........... Martin
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7th Feb 2019, 5:57 pm | #57 | |
Nonode
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Location: North Somerset, UK.
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Re: A Quick Question about Halogen to LED conversion
Quote:
And yes the almost universally accepted term for these is "electronic transformer" They have an AC output at a very high frequency. |
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13th Mar 2019, 5:48 pm | #58 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
Posts: 729
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Re: A Quick Question about Halogen to LED conversion
Finally got it sorted 🙂
Took delivery of these bulbs today, and everything is working fine.
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Best Regards, Peter. |
13th Mar 2019, 6:32 pm | #59 |
Heptode
Join Date: Oct 2018
Location: Blackburn, Lancashire, UK.
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Re: A Quick Question about Halogen to LED conversion
Sorry if I'm being annoying, but can I ask another question?
I currently (sorry! NPI!) have a 20 watt, 12 volt halogen spotlight over a worktop in my kitchen. Would anything catastrophic happen if I replaced the bulb with this new 5watt LED bulb? Do transformers adjust to how much power they are asked to supply? I don't want it to get 'sort of constipated' because the lamp doesn't need the full wattage it is designed to supply!
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13th Mar 2019, 7:38 pm | #60 |
Heptode
Join Date: Oct 2012
Location: London, UK.
Posts: 500
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Re: A Quick Question about Halogen to LED conversion
That actually looks like a transformer rather than a switch mode power supply. It will be perfectly OK. A transformer will only supply the power required.
Think what would happen if those big transformers at sub stations force their max power output to peoples homes. |