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Old 01-02-2011, 02:02 PM   #1
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240V to 12V desk lamps


Hi all,

well, I do have a good number of desk lamps that operate at 12V, but they are powered at 240V.
The bulbs are those little halogen ones, 12V 20W.

I took a couple of pictures to show you the transformer they have right now and would like to know where I could buy a 120V to 12V transformer I can apply to the lamp, basically I expect you have the same here in NA, but different voltage.





For better color understanding of the second picture:

Marrone = brown
Giallo = Yellow
Nero = black
Blu = blue

Again, two different desk lamps, first picture the transformer is directly linked to the cable.

Which place can I find such transformers on the internet?

Thanks
Alex

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Old 01-02-2011, 02:24 PM   #2
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240V to 12V desk lamps


http://www.voltage-converter-transfo...ansformer.html

Try this. I have one similar I got from school. I use it to test anything.
The one I have goes from 120 volts to 12 volts.

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Old 01-02-2011, 02:33 PM   #3
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240V to 12V desk lamps


Quote:
Originally Posted by Gabriel24 View Post
http://www.voltage-converter-transfo...ansformer.html

Try this. I have one similar I got from school. I use it to test anything.
The one I have goes from 120 volts to 12 volts.
Thanks for your replay.
I have got already four of them at home, what I am looking is something different, as you can see from the pictures.
There are 120V to 12V transformers that you can apply directly to the table lamps, I would guess...

Cheers
Alex
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Old 01-02-2011, 07:59 PM   #4
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240V to 12V desk lamps


Try here http://www.minute-man.com/acatalog/1...nsformers.html
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Old 01-03-2011, 11:26 AM   #5
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240V to 12V desk lamps


Quote:
Originally Posted by hayewe farm View Post
This looks much better man, thank you!

Alex
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Old 01-03-2011, 08:18 PM   #6
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240V to 12V desk lamps


One more question:

Do I have to buy transformers with different VA values comparing to the 240V ones?

If you look at the pictures I posted:

1) transformer is 230V > 12V - 20VA
2) transformer is 220V > 12V - 50VA

So, I was thinking to replace:

1) with http://www.minute-man.com/acatalog/info_T1220.html
2) with any you recommend in http://www.minute-man.com/acatalog/1...nsformers.html

Thank you for helping me with the right decision.

Alex
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Old 01-04-2011, 04:07 PM   #7
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240V to 12V desk lamps


Anybody?

Thank you
Alex
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Old 01-04-2011, 06:42 PM   #8
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240V to 12V desk lamps


An output of 12 volts at 20 va is what you need, so any of the 120 volt units with that output will work.
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Old 01-04-2011, 06:45 PM   #9
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240V to 12V desk lamps


Quote:
Originally Posted by hayewe farm View Post
An output of 12 volts at 20 va is what you need, so any of the 120 volt units with that output will work.
Thanks for you reply.

Is this also valid for the lamp which originally mounted a 50 va?

Alex
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Old 01-04-2011, 07:06 PM   #10
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240V to 12V desk lamps


Yes, you just need to select the desired input 120 volts, 230 volts , 240 volts, etc and the desired output XX volts at XX va.
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Old 01-04-2011, 09:06 PM   #11
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240V to 12V desk lamps


Quote:
Originally Posted by hayewe farm View Post
Yes, you just need to select the desired input 120 volts, 230 volts , 240 volts, etc and the desired output XX volts at XX va.
Well, the point is that for the filament transformers the va values are not provided in the website, therefore I do not know which one corresponds to the original 50va.

Also, the present lamp has a two positions switch, depending which position I select the halogen lamp provides more/less light.
How is this achieved by the original transformer being the output always 12V ?
Does the switch limit the voltage provided in someway according to the chosen position?

Thanks
Alex
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Old 01-04-2011, 09:41 PM   #12
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240V to 12V desk lamps


The pictures you posted showed 2 transformers both with single outputs. One is 12 vac 20 va and the other 12 vac 50 va. You can chose any of the ones on on this page http://www.minute-man.com/acatalog/1...nsformers.html with the same out put. I would chose the Amseco XR-1250LED 12 v 50 va and the RT-1220SL/M for the 12 v 20 va

Multi light levels can be achieved with either multiple lamps switched separately or together or with in line resistors. I am not familiar enough with your lights to say which is used.

The link you listed http://www.minute-man.com/acatalog/1...nsformers.html are for transformers in the MA to 2 va range and will not work they are all to low an output.
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Old 01-05-2011, 11:30 AM   #13
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240V to 12V desk lamps


Quote:
Originally Posted by hayewe farm View Post
The pictures you posted showed 2 transformers both with single outputs. One is 12 vac 20 va and the other 12 vac 50 va. You can chose any of the ones on on this page http://www.minute-man.com/acatalog/1...nsformers.html with the same out put. I would chose the Amseco XR-1250LED 12 v 50 va and the RT-1220SL/M for the 12 v 20 va

Multi light levels can be achieved with either multiple lamps switched separately or together or with in line resistors. I am not familiar enough with your lights to say which is used.

The link you listed http://www.minute-man.com/acatalog/1...nsformers.html are for transformers in the MA to 2 va range and will not work they are all to low an output.
I understand what you are saying, but there is a reason why I'd rather prefer the second transformer to be "filament" type.
The reason is that he can be assembled in the lamp base, like the original, so automatically its weight will balance the lamp getting a twofold advantage: balancing the lamp and avoid any external transformer.

Is there any other website I could find a filament transformer with the specs I require for this lamp?

Thank you!
Alex
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Old 01-05-2011, 12:46 PM   #14
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240V to 12V desk lamps


Here are several that would work
http://www.lbclighting.com/mm5/merch...efdom=Shopping

http://www.elightbulbs.com/catalog_p...E&prod=LW12750

http://www.buylightfixtures.com/120-...ansformer.aspx
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Old 01-05-2011, 09:18 PM   #15
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240V to 12V desk lamps


Many thanks, I will have a look.

Cheers
Alex

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