Author Topic: 120V LED Bulbs at 220V  (Read 1270 times)

0 Members and 1 Guest are viewing this topic.

Offline PabloFTopic starter

  • Newbie
  • Posts: 3
  • Country: ar
120V LED Bulbs at 220V
« on: October 13, 2017, 01:58:11 pm »
Hi,

I'm thinking of buying 6 of these vintage looking LED bulbs in the US and bringing them to argentina.

The problem is that here we use 220v instead of 120v.

The obvious answer is to put a transformer, but the problem is that I also would like to use a dimmer (they are dimmable LED bulbs),

Dimmers create hard edges in the current that could damage the transformer.

So now the other obvious answer is to put 2 bulbs in series... this sounds to simple to be true.

Does anybody think it could work with this type of LED bulbs?
https://goo.gl/zvoDFy

Thanks in advance.
« Last Edit: October 13, 2017, 02:57:22 pm by PabloF »
 

Online schmitt trigger

  • Super Contributor
  • ***
  • Posts: 2223
  • Country: mx
Re: 120V LED Bulbs at 220V
« Reply #1 on: October 13, 2017, 02:09:48 pm »
You did not add a website link or file or photo to your post.

But anyways...because of the non-linear load characteristic of the lamps AND the required dimming, I don't think the voltage will divide equally.
Use a transformer instead.

If the dimmer is located AFTER the stepdown transformer, there will be absolutely no harm done to it.
 

Offline TK

  • Super Contributor
  • ***
  • Posts: 1722
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: 120V LED Bulbs at 220V
« Reply #2 on: October 13, 2017, 02:51:39 pm »
If the dimmer is a wall mounted unit, it will be difficult to add it after the transformer as the whole house wiring is 220V and also the dimmer needs to be 120V if added after.  If it is for a permanent mount, do not mess with transformers as they can heat, fail and it is a fire hazard.  Is is better to get 12V LEDs and use 220V to 12V DC power adapter that are certified in Argentina.
 

Offline PabloFTopic starter

  • Newbie
  • Posts: 3
  • Country: ar
Re: 120V LED Bulbs at 220V
« Reply #3 on: October 13, 2017, 04:00:01 pm »
Unfortunately this type of LED bulbs don't come in 12v.

Connecting the dimmer on the 110V side of the transformer is a risk I'm not willing to take, unless I could make some sort of low pass filter to smooth out the current spikes.

Should I discard the 2 bulbs in series simple solution?

« Last Edit: October 13, 2017, 04:06:06 pm by PabloF »
 

Offline capt bullshot

  • Super Contributor
  • ***
  • Posts: 3033
  • Country: de
    • Mostly useless stuff, but nice to have: wunderkis.de
Re: 120V LED Bulbs at 220V
« Reply #4 on: October 13, 2017, 04:16:56 pm »
I'd give the series connection a try - worst thing to happen is two defective bulbs.
These filament kind LED bulbs have a quite simple circuit inside - basically a ballast capacitor in series to the AC input and a rectifier. Connecting them in series should work IMO - but don't blame me if it doesn't. Take precautions in case it doesn't, try it in a safe place, not the final place where they shall be installed.
Safety devices hinder evolution
 

Offline edavid

  • Super Contributor
  • ***
  • Posts: 3382
  • Country: us
Re: 120V LED Bulbs at 220V
« Reply #5 on: October 13, 2017, 05:16:44 pm »
 

Offline PabloFTopic starter

  • Newbie
  • Posts: 3
  • Country: ar
Re: 120V LED Bulbs at 220V
« Reply #6 on: October 13, 2017, 06:43:00 pm »
edavid, I think that's the safest option, thanks for the advice everybody.  :-+
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf