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  1. #26
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    If it's got 5 modes it's almost certainly regulated.

    How long does it run for ?

    Does it dim or stay bright to the bitter end ?
    Making a Pilom Triple LED Headlight ? I have parts available :)
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  2. #27
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    The light just slowly drops down, it seems like direct drive to me. The 5-modes are just created by PWM I think. I don't even know if it's possible to easily make an 18650 P7 light regulated since a fully charged 18650 will push over 2.8 amps briefly and then less as it drops so a simple boost or buck setup wouldn't work.

  3. #28
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    Quote Originally Posted by Wiggle View Post
    I don't even know if it's possible to easily make an 18650 P7 light regulated since a fully charged 18650 will push over 2.8 amps briefly and then less as it drops so a simple boost or buck setup wouldn't work.
    2.8A is the most a 18650 can supply ?
    Making a Pilom Triple LED Headlight ? I have parts available :)
    Bell R2 Conversion
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  4. #29
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    Quote Originally Posted by Unknown Cyclist View Post
    2.8A is the most a 18650 can supply ?
    No it can supply more, but the Vf needed to push over 2.8A is too high for an 18650 except when fully charged.

  5. #30
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    Quote Originally Posted by Wiggle View Post
    No it can supply more, but the Vf needed to push over 2.8A is too high for an 18650 except when fully charged.
    Wouldn't that only apply to direct drive ?

    If you had a 2800 mAh driver it would pull more amps as the voltage decreased ?
    Making a Pilom Triple LED Headlight ? I have parts available :)
    Bell R2 Conversion
    HID Project
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    Aurora P7 Review

  6. #31
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    Quote Originally Posted by Unknown Cyclist View Post
    Wouldn't that only apply to direct drive ?

    If you had a 2800 mAh driver it would pull more amps as the voltage decreased ?
    2800mA you mean but yes it should. When I get home I'll measure Vf across the LED as the battery drops down and see if it changes. If Vf holds steady, it is indeed regulated. But I suspect it isn't because when I experimented with some thinner gauge wire, the minor voltage drop across that wire had a visible effect on the brightness of the light which shouldn't happen.

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