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Thread: Incandescent to LED conversion

  1. #1
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    Default Incandescent to LED conversion

    OK this might not work. I don't know. But here it goes. Could you buy LED's in bulk and replace the incandescent bulbs in your old strings? It seems to me this would be "GREEN" and save you some green. Just a thought.

    Merry Christmas everybody

  2. #2
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    Default Re: Incandescent to LED conversion

    Nice thought but won't work. LEDs act very different electrically. The LEDs need a rectifier and some protection circuitry to keep current spikes from turning them into dark emitting diodes (DEDs.) This is typically a small cylinder or lump in the LED string at one or more places.

    Save yourself time/frustration/money by purchasing LED strings designed for holiday lighting from the after Christmas or early season sales from the vendors mentioned elsewhere on these forums.
    (yet another Don)

  3. #3
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    Default Re: Incandescent to LED conversion

    Quote Originally Posted by BF210 View Post
    The LEDs need a rectifier and some protection circuitry to keep current spikes from turning them into dark emitting diodes (DEDs.) This is typically a small cylinder or lump in the LED string at one or more places.
    (yet another Don)
    DEDs?

    LOL!!!!!

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  4. #4
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    Default Re: Incandescent to LED conversion

    WRONG they don't NEED a rectifier a led is a diode in itself...light emitting diode...... they work fine with ac except they pulse slightly from the 120 ON OFF cycles a second (60 HZ)

    Some sets have the rectifiers to eliminate the pulsing...others do not

    if u can calculate the voltage correctly and can get the leds to fit by all means do it


    one thing tho every led needs to in series the same way..one side of an led is flat at the bottom this is its negitive side.....so you need positive to negative with every bulb

  5. #5
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    Default Re: Incandescent to LED conversion

    You could replace all the lights with LED's. You'd need to add a diode and a resistor. You would also need to water proof all of the LED's. It's a lot of work for maybe not so great of a result.
    Quote Originally Posted by raethebj View Post
    WRONG they don't NEED a rectifier a led is a diode in itself...light emitting diode......
    I doubt that any LED will take a reverse voltage of 170, at least not for long, so a diode that blocks is needed.
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    Default Re: Incandescent to LED conversion

    I have done this with 2 low voltage 150 light strings and while it was a success I won't do it again.
    I used a small rectifier package at the start of the string and then cut and soldered and insulated each section of the string to get to down to the correct number of bulbs and added a resistor to limit the current.
    It was a major effort to get a couple of strings that I needed in Red and Green for my mini trees.

    Jon

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    Default Re: Incandescent to LED conversion

    Quote Originally Posted by ErnieHorning View Post
    You could replace all the lights with LED's. You'd need to add a diode and a resistor. You would also need to water proof all of the LED's. It's a lot of work for maybe not so great of a result.I doubt that any LED will take a reverse voltage of 170, at least not for long, so a diode that blocks is needed.
    The reverse voltage however is spread out over 'x' LEDS.. ( if you ware using Blues, say 50 on a 110VAC line ), so you are only talking about 3.5V per led.. that level they can handle.

    personally, i'd say do it nicely, use DC.
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    Default Re: Incandescent to LED conversion

    Note that just adding two diodes in series does not make a diode capable of blocking twice the voltage. Their leakages may be significantly different and the low leakage diode will see most of the voltage.
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  9. #9
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    Default Re: Incandescent to LED conversion

    I have yet to start dabbling in the led string arena, and I'm wondering whether it's feasible to run the LEDs in parallel with straight DC instead of in series? Or are any strings actually designed/manufactured this way at all? I'm thinking that a string of 100 LEDS each drawing 20ma would only be a couple amps of total draw on the line.

    Or am I so far off base that it's a completely ridiculous concept?

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  10. #10
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    Talking Re: Incandescent to LED conversion

    Whilst you can run LEDs in parallel, they may not share the current well if there's too much resistance in the wiring. The ones closest to the power source may hog more current (and be brighter) than the ones further away.
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