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Thread: 128 LED Chinese.

  1. #1
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    Default 128 LED Chinese.

    I am a n00b here, but a flashlight/lightbulb freak for years. Just picked up a Chinese 128 led flashlight. The aluminum case seems of really good quality. I havent dropped it yet tho! It is VERY bright for an LED flashlight, but its got 128! It was ~$24 USD total from ebay. I took some things apart, and did some measurements, calculations, ETC. With a freash set of 4 AA batteries , LED's were dropping 3.08 volts, and ~3.6 across the single 5.0 1% resistor. wich figgured to be about 5ma per LED. What you think of these cheapo Chinese flashlights?

  2. #2
    Flashaholic* iced_theater's Avatar
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    Default Re: 128 LED Chinese.

    Very bright for the money. I have a 118 led version, I took out the resistor and run it direct drive. Overall output it's brighter than all of my other lights. I sometimes think about putting in high output Nichia led's in place and have a 500 plus lumen light.

  3. #3
    Flashaholic* ace0001a's Avatar
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    Default Re: 128 LED Chinese.

    There's Chinese people out there with 128 LEDs on them??

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    Default Re: 128 LED Chinese.

    Quote Originally Posted by ace0001a
    There's Chinese people out there with 128 LEDs on them??
    Well, I guess if they tape one of these flashlights to thier head...

  5. #5
    Flashaholic* EngrPaul's Avatar
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    Default Re: 128 LED Chinese.

    Where are you leading 128 Chinese?

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    Default Re: 128 LED Chinese.

    Quote Originally Posted by iced_theater
    Very bright for the money. I have a 118 led version, I took out the resistor and run it direct drive. Overall output it's brighter than all of my other lights. I sometimes think about putting in high output Nichia led's in place and have a 500 plus lumen light.
    Any idea on how much current is being drawn from the bettery without a resistor? How long batteries last? I was thinking about putting a 2 ohm in place of the 5 thats in mine. Oh is yours a 4 aa, or a 3 d version?

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    Flashaholic* EngrPaul's Avatar
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    Default Re: 128 LED Chinese.

    It would be interesting if you get better performance with NiMH (less internal battery resistance) and e^2 lithium (more voltage and less resistance).

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    Default Re: 128 LED Chinese.

    Quote Originally Posted by EngrPaul
    It would be interesting if you get better performance with NiMH (less internal battery resistance) and e^2 lithium (more voltage and less resistance).
    Of course, espicialy with no resistor, but batteries wouldnt last long. My first set of alkalines are down to 1.3 volts apice , and I just put them in two days ago. I added ~2.3 ohms to the 5 thats in there, so its about 7.3 ohms now. Shows no noticable difference in brighness, but will gave me a bit more run time...

  9. #9
    Flashaholic* iced_theater's Avatar
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    Default Re: 128 LED Chinese.

    Quote Originally Posted by slurp812
    Any idea on how much current is being drawn from the bettery without a resistor? How long batteries last? I was thinking about putting a 2 ohm in place of the 5 thats in mine. Oh is yours a 4 aa, or a 3 d version?
    I have no idea, if I knew how to use an ohm meter correctly I'd do it and let you know. I have the 4aa version, I'm sure the batteries don't last very long at all though.

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    Default Re: 128 LED Chinese.


    OKl thanks. I want a bit more run time, its plenty bright enough...



    Quote Originally Posted by iced_theater
    I have no idea, if I knew how to use an ohm meter correctly I'd do it and let you know. I have the 4aa version, I'm sure the batteries don't last very long at all though.

  11. #11
    Flashaholic* ace0001a's Avatar
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    Default Re: 128 LED Chinese.


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