LED units and transformer help

[guysy]

I have 8x LED down lighters, That are ment to be kitchen floor plan lighting units but where never used... They are currently lighting my Vinyl selection so i can see what im selecting easily...

Its hooked up as 4x LEDS to 1x 12V driver...

8x LEDS total 2x drivers.

I was running 2x drivers to one Mains plug and they lasted a few months but now have blown. Was my problem running the 2x drivers off one plug? I was told it would be fine because they would both get the correct current.

Now i need a replacement transformer... Am i looking at a 24v ? because im running 2... Or just a 12V DC? because they will still get there current needed for each?

The instructions say 6 LED units can be run from one 12v transformer... So im guessing its obvious 12v wont power all 8?

Bit of help please, Im just looking for clarification.

Ebay links to cheap but good transformer and advice wanted, Cheers.

 

[Dink]

i'm lost lol

are they high power leds?

white leds only need 3.6v but it's all about the current.

even if they were 5w leds you would only need like a 65VA power supply

 

[guysy]

8x of these mate:

 

[guysy]

I have wired them up (each led unit clips into the next) so there are 2 sets of four and each set of 4 where running off a 12v transformer .. However i would like to get all 8 clipped in together, And run it off one transformer.

 

[Dink]

is it 12v ac or dc?

tbh i'd go for something like this

but remember there is a massive difference between a 12v led driver and a 12v psu

 

[guysy]

It was a small white box for each driver, And im pretty sure DC.

Would that supply happily power them all then? If a little dim because its only 12v?

And what do you mean by difference between driver and psu? The psu being more reliable?

Because the little drivers.. where s**t tbh.

cheers.

 

[Dink]

drivers have in built current limiting as leds are really don't like being driven with more current than they are designed to

so if the driver is gone you really need to get a new driver designed specifically for your leds.

is there a current rating on the driver ?

 

[guysy]

I dont know what im looking for so heres a pic, But i guess the 0.085A MAX is what im looking for?

Excuse the holes, I drilled them in an attempt to keep the second set cool.

 

[Dink]

thats a 24v 10VA psu so if you had two of those you need a 24v 20VA or 1A psu to replace both

 

[guysy]

Cheers for your help so far really apreciate it.

So to replace both drivers for one... i need a 24v 20va / 1A PSU... And that will allow me to hook all 8 up to that right?

Im not finding many on ebay searching 24v 1a.. Any sites you know of etc?

Cheers.

 

[Dink]

the 24v one off here and just cut the plug off

 

[guysy]

The 24v one yeah? just checking, Cheers.

 

[Dink]

order code 85-2953

 

[Andy_con]

if someone needs 12v then do not get a 24v psu.

it may have been the case that the leds were drawing to much current, the psu over heated and blew.

get a decent 12v psu.

what is the full spec of the leds?

 

[guysy]

Cheers Dink...

Andy im not too sure what the leds are drawing as current. There are 4 SMDs to each square circuit.

Now confused again...? the 24v 1A will work or?

Im not sure if the drivers overheated previously or just wernt good enough.

 

[Andy_con]

well you first said 12v then you posted a pic of a 24v psu? so im not sure either lol

well where did you get the leds from? try find a spec it makes life alot easier

 

[guysy]

The LEDs are MFI kitchen lights, Supposed to be used for the kitchen install but wernt due to my dads decision.. Each unit is 4 SMDs on a circuit, Each driver takes a max of 6 units.

Im guessing after your telling me, And looking at it each driver is 24v?

Although the insruction says position each 12V driver, But yeah i see what your saying about the 24v driver.. I am confused myself..

Any help?

 

[guysy]

Any further help please fella's?

 

[Andy_con]

hard to say really...

probably best to buy a 24v psu to match the existing one.

excellent quality 24v 1.1amp psu

http://cgi.ebay.co.uk/25Watt-24V-1-..._Measurement_Equipment_ET?hash=item4a9fb5d9a8

bit hard to tell due to all the holes but i think your current psu gives 0.085A, that one on ebay gives out 1.1A

so slightly more powerful

 

[guysy]

Cheers mate, Yeah its max 0.85A as far as i can make out.. so the 1.1A will be fine right?

Cheers for your help.

 

[Andy_con]

yep 1.1amp is more power

 

[guysy]

Cheers.

 

[Lagerlout]

That ebay one above is over twice the power @ 25W. Old one is 10W.

Also, max current of your old one is 0.085A, which is 85mA, so less than a tenth of the current of the one above.

Will be plenty. lol.

 

[guysy]

Will the power supply be too powerfull and burn the LEDS out?

Just bought it.

 

[Lagerlout]

Shouldn't be. I'm assuming the small boards they are mounted to have current limiting resistors in series, to regulate the current. If not a regulated power supply would be a better bet.

Shouldn't mix and match with stuff like this really, from my days at college, LED's are sensitive little buggers lol

 

[Andy_con]

That ebay one above is over twice the power @ 25W. Old one is 10W.

Also, max current of your old one is 0.085A, which is 85mA, so less than a tenth of the current of the one above.

Will be plenty. lol.

indeed, but just encase the old psu couldnt handle the current drawn

 

[guysy]

^that is true, For just 4 LEDs to one driver, I will give this a try and hope it lasts.

 

[Dink]

the 0.085A is the input current for the psu

 

[guysy]

Just got the PSU up and running, All working excellent, And the PSU is running pretty cool.

Very happy, Cheers for the help fellas.

What it was for ha:

 

[Dink]

glad you got it sorted mate

looks good

 

[Lagerlout]

Good idea that!