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post #1 of 10 (permalink) Old 14-08-2019, 11:37 Thread Starter
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House electrics

I've changed the halogen lights in my house bathroom to LEDs (they've only been sitting there about 2yrs!)

However, I have considerable flicker after a few minutes and I'd be afraid it might trigger an epileptic seizure in someone.

Investigation tells me the old driver won't work too well if there's too little power drain so I intend changing one of the bulbs back to halogen rather than replace the driver.

I think the old bulbs were 50 or 60w with one being, I think, 35w. The new ones total, I think, 22 or 30w (they were such a pain to get up I don't want to take them out again to check!)

I have a photo of the transformer but can't interpret the relevant information.

Can anyone tell me what's the minimum wattage this transformer needs? Thanks.
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File Type: jpg Bathroom Transformer_1565778985085.jpg (459.6 KB, 16 views)

Jean
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post #2 of 10 (permalink) Old 14-08-2019, 11:49 Thread Starter
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Ah, answering my own question, I've discovered that the 20-60VA means the min wattage is 20W. Why not say that?!

Maybe my replacement bulbs were lower wattage than I remember.

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post #3 of 10 (permalink) Old 14-08-2019, 12:18
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Your LED bulbs can be from (12v) 1 to 5 watt whereas the transformer is type specific for Halogen.
I don't know if they are compatible...age makes me forget these things...sorry.
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post #4 of 10 (permalink) Old 14-08-2019, 15:01
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No, far too complex Jean. If it aint broke syndrome.

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post #5 of 10 (permalink) Old 15-08-2019, 01:40
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I'd be surprised if it's because there's too little draw on the transformer - perhaps the other way around as you have to look at the equivalent wattage of the LED's. But I'm a bit confused about what you were running before from the transformer - it looks as though it's rated at 60W max but you say that you had several bulbs connected? Are you sure there isn't more than one transformer there?

In any event if the new LED's total 22W to 30W in LED terms then that is equivalent of between 85W and 110W in halogen terms which far exceeds the 60W capability of the transformer. Try taking out some of the LED's to get below 60W equivalent and see what happens. If the flickering stops then you know that is the problem and you need a new bigger / LED transformer.

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post #6 of 10 (permalink) Old 15-08-2019, 09:37 Thread Starter
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Thanks Peter.

It's a real pain to fit the bulbs - they're subtly different in shape so the 'keeper' spring is very awkward to fit.

I only saw the one transformer but that's not to say there aren't others...

I'm away this weekend so will have to wait another wee while.

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post #7 of 10 (permalink) Old 16-08-2019, 09:03
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Remove one LED and replace it with one Halogen. If that does not solve the problem your light is incompatible with LED bulbs. If it is a dimmable light you need the dimmer turned right up. If it still flickers then bin the light and buy a new one.
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post #8 of 10 (permalink) Old 16-08-2019, 21:14 Thread Starter
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I had a 'lightbulb' moment this morning (haha!) - if the previous bulb was 50-60 halogen and the transformer is 20-60, then it must be 1 transformer per bulb even though I didn't see them (I didn't look).

So, with the minimum being 20 that would mean a massively bright LED bulb.

So looks like a replacement of the drivers - unless my thinking is up the creek?

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post #9 of 10 (permalink) Old 18-08-2019, 10:46
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It will be cheaper for you to replace the whole lamp unit with 240v Led sealed units that are IP rated for bathrooms than replace the transformers. Screwfix have them for around £6.99 each. Made by LAP


And your right there is a minimum current draw on those transformers, below that it will flicker

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post #10 of 10 (permalink) Old 18-08-2019, 11:43 Thread Starter
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Thanks Pete, will have a look at those.

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