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RWM

LED Question

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I just bought a brand new string of 5mm shunted warm white leds with no transformer on the string. It also came with out the UL sticker, is the string safe to use? I've never seen leds without the transformers.

Edited by RWM

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The transformer may be built into the plug.

Where did you get them?

How many lights are on a string?

No UL tag? Tisk Tisk. Use at your own risk!

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I got the lights from Building 19, its a discount store in New England. I got 7 other sets of white leds from there, these had the ul tags & 3 transformers per string. Its a 50 count string.

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Question, several people have in this thread mentioned a transformer. Now this is the first time I have heard anyone mention a transformer. All of the other reading I have been doing in different threads have made a mention of a rectifier, resistors and a cap. Also I would suspect that if a transformer is actually being used. That one could not use the fade feature on their controllers. Is that right?

Are you guys sure that it is a transformer? The reason I ask is that if it is a fact that one could not fade if a LED string has a transformer in it. Then I need to stay away from these light strings.

Please enlighten me.

Thanks

Max

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Question, several people have in this thread mentioned a transformer. Now this is the first time I have heard anyone mention a transformer. All of the other reading I have been doing in different threads have made a mention of a rectifier, resistors and a cap. Also I would suspect that if a transformer is actually being used. That one could not use the fade feature on their controllers. Is that right?

Are you guys sure that it is a transformer? The reason I ask is that if it is a fact that one could not fade if a LED string has a transformer in it. Then I need to stay away from these light strings.

Please enlighten me.

Thanks

Max

If a 50 light LED string has three modules then most likely the string is full wave. The modules wold be before the first LED, between the 25th and 26th LED and after the last LED.

If the module is between the 1st and 2nd and also between the 49th & 50th then most likely they are bias resistors and the string is half wave.

Both half wave and full wave would look the same in your display, only half wave will look different if used on tree branches that move a lot in the wind, other than that you can not tell much difference, not even intensity.

No they are not transformer but they do look like it.

As for using a transformer with LED's the answer is yes you can, I have done that this spring proving out some designs when I only needed a few LED's on one channel using AC. I used one of those train transformers you come in the Train Sets.

It fades, shimmers, and twinkles fine. It does work but more testing is needed. I ran mine for weeks without any problems.

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