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Thread: Direct Drive P7

  1. #1
    mtbr member
    Join Date
    Jul 2008

    Direct Drive P7

    My original intention was to build a parallel pack of 4 x 3.6v 2400mAh lith-ion cells and direct drive a p7 LED. Since the voltage is the same I didn't think I would have a problem I have had a few discussions on this forum about this and I have been told that running a SSC P7 LED on a pack with out a driver can fry the LED. What is it that will fry the LED? It is the fact that the pack will be 4.2v freshly charged and with 4 cells the 4.2v will be sustained for too long? If so, are single cell configurations OK with 4.2 v because the 4.2v is not maintained for very long before the voltage drops? I have also been told that it is because there is more available current? If I am supposed to consider current like gas in the tank then why would too much gas be a problem. Or is it that too much voltage will cause the led to draw too much current.



  2. #2
    mtbr member
    Join Date
    Apr 2010
    I used P7 with 4p 18650 - it's OK.

  3. #3
    mtbr member
    Reputation: HEY HEY ITS HENDO's Avatar
    Join Date
    Feb 2008
    led`s are different than incandicent lamps
    you can connect a bulb rated at 6v to a 6v battery, no problemo
    i always imagine led`s as fuses, P7 being a 3 amp fuse
    connect this directly to your battery pack and .... *POOF*
    so you need to limit the available current with a resistor or driver
    ...Scun.thorpe, UK

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