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Old 02-08-2012, 07:54 PM   #1
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LEDs kill downlight transformers


I have a new house with many downlights at 50W each. With a view to save some power I purchased a dozen 4W LEDs to replace the halogen bulbs in the most heavily used fittings.

Initially I replaced four of them and switched on. All was bright for about an hour then two of them flickered and died. A little exchange experiment shows that the Luxalite GD32LH transformers on each fitting have died.

I am now reluctant to go and exchange the other lights as I don't want to replace a large number of transformers - and what would I replace them with?

Any suggestions as to what approach to take?

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Old 02-08-2012, 08:02 PM   #2
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LEDs kill downlight transformers


Are these "electronic transformers"? If so, they need to be loaded a certain amount to be stable.

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Old 02-08-2012, 09:01 PM   #3
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LEDs kill downlight transformers


Yes they are electronic transformers.
How do I find how much load they require? Can I achieve that by rewiring the fittings in parallel?
Is there a better approach?
What happens when a fitting is powered up without any bulb at all?
Are the dead fittings recoverable?

Thanks for any suggestions. Peter
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Old 02-08-2012, 09:24 PM   #4
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Quote:
Originally Posted by PeterH View Post
Yes they are electronic transformers.
How do I find how much load they require? Can I achieve that by rewiring the fittings in parallel?
Is there a better approach?
What happens when a fitting is powered up without any bulb at all?
Are the dead fittings recoverable?

Thanks for any suggestions. Peter
There should be a wattage rating on the transformer. I believe you will be ok with a 50% load.

You could parallel but you may end up with a lot of lights hooked together.

I don't have any better approach ideas.

The transformer may not start up at all with no load so it might be ok. You will just have to check them out.
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Old 02-08-2012, 09:39 PM   #5
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LEDs kill downlight transformers


It may not just be an issue of the amount of load, but also the type of load. Most electronic transformers operate at very high frequencies and are not intended to power anything but an incandescent lamp. Most LED lamps have electronic power supplies in them that expect to receive 60Hz power. Using a high frequency transformer with an LED lamp that's not specifically designed for it could result in either the lamp or the transformer failing.
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Old 02-08-2012, 10:26 PM   #6
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LEDs kill downlight transformers


The word fitting sound like you are from UK or Aussie area is that correct?

Now with the electroic transformers I know one poster did nailed on that one and also if run at wrong supply voltage that will do the same thing.

And this transformer is vented or got overheated if overheated you will have to check why it causing to overheat due poor ventation ( most common cuprit )

Merci,
Marc
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Old 02-08-2012, 10:32 PM   #7
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Originally Posted by frenchelectrican View Post
The word fitting sound like you are from UK or Aussie area is that correct?

Now with the electroic transformers I know one poster did nailed on that one and also if run at wrong supply voltage that will do the same thing.

And this transformer is vented or got overheated if overheated you will have to check why it causing to overheat due poor ventation ( most common cuprit )

Merci,
Marc
He is going from a 50 watt load to a 4 watt load. Same supply voltage and was working ok stock with the 50 watt load.
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Old 02-08-2012, 10:36 PM   #8
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LEDs kill downlight transformers


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He is going from a 50 watt load to a 4 watt load. Same supply voltage and was working ok stock with the 50 watt load.
I am aware with that but let me address to the OP this part did the OP do have dimmer switch or not ? If the OP did have dimmer switch there are some of them need minum load to keep it running so once you drop below X numbers of wattage to keep it running it will kinda like drop out.

And going from Incandsent to LED that will useally wreck hovac if not watching the power supply espcally with dimmers due some of the LED drivers will not take dimmer at all.

Merci,
Marc
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Old 02-08-2012, 10:53 PM   #9
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LEDs kill downlight transformers


No dimmer. Just simply replaced incandescent with LED.
Obviously I must replace transformers too.

Thanks for all your replies. Peter
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Old 02-08-2012, 11:00 PM   #10
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Now I can see where this going and you did have 12 volts 50 watt halogen bulbs and go with LED and with electronic transfomer it can wreack hovac but magatic not too bad.

Do you know what brand name of the LED bulb that you are trying ?

Merci,
Marc
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Old 02-08-2012, 11:38 PM   #11
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LEDs kill downlight transformers


The LEDs are unbranded (Chinese).
The boxes are marked:
MR16 4*1W
12VCE RoHS
Thanks for your interest, Peter
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Old 02-08-2012, 11:55 PM   #12
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Originally Posted by PeterH View Post
The LEDs are unbranded (Chinese).
The boxes are marked:
MR16 4*1W
12VCE RoHS
Thanks for your interest, Peter

Probly they are cheap stuff that why it don't last long if you get little more expensive stuff like well knowen namebrand you may have less issue with it.

So try that route to get better qualnty LED device.

Oh the other thing check with the label to make sure they will work with recessed fitting ( Cans for stateside guys )

Merci.
Marc
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Old 02-09-2012, 05:22 AM   #13
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LEDs kill downlight transformers


Quote:
Originally Posted by zappa View Post
He is going from a 50 watt load to a 4 watt load. Same supply voltage and was working ok stock with the 50 watt load.
Where is it stated that the voltage of the lamp has been matched to the voltage of the luminaire?
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Old 02-09-2012, 05:27 AM   #14
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Originally Posted by brric View Post
Where is it stated that the voltage of the lamp has been matched to the voltage of the luminaire?
Yes sir.....we totally missed that point.
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Old 02-09-2012, 05:37 AM   #15
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LEDs kill downlight transformers


Quote:
Originally Posted by brric View Post
Where is it stated that the voltage of the lamp has been matched to the voltage of the luminaire?
I wanted to ask mpoulton about his comment last night but I was busy on another thread and he went offline. Are LED's even supposed to work with low voltage AC and electronic transformers?

Note to French Electrician. According to the OP his transformers were biting the dust, the LED's were surviving.


Last edited by zappa; 02-09-2012 at 05:47 AM.
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