IR led light powered by car battery.

Discussion in 'General Electronics Chat' started by johnpuppa, Apr 20, 2017.

  1. johnpuppa

    johnpuppa

    Joined:
    Apr 20, 2017
    Messages:
    1
    Likes Received:
    0
    Hello,

    I'm trying to build a small project using arduino and I would like to control a 12V lamp through a mosfet.
    As a power source for the lamp I was thinking of a 12V car battery.
    The lamp I'm planning to use is this:
    http://www.ebay.co.uk/itm/96-LED-In...t-Lamp-For-Security-CCTV-Camera-/162184422490
    From my analysis, since a small car battery has around 60A, and leds drag as much current as they can, I don't think I can directly attach the battery to the lamp. Am I right?

    If I want to limit the current to a 2A I would need a 6ohm resistor as 12/6 =2A. However 2A * 12V is quite a lot of dissipation... and I would need a a 24W resistor to be safe.. Am I right with this analysis??
    Am I better off considering a different type of battery?

    Thanks!
     
    johnpuppa, Apr 20, 2017
    #1
    1. Advertisements

  2. johnpuppa

    KMoffett

    Joined:
    Jan 21, 2009
    Messages:
    611
    Likes Received:
    57
    Location:
    Minnesota USA
    The lamp is spec'd at 12VDC/15W. So it will only draw 1.25A. It has internal current limiting. "Generally" when LEDs are spec's as a specific voltage, like 12VDC, they have internal limiting.

    Ken
     
    Last edited: Apr 20, 2017
    KMoffett, Apr 20, 2017
    #2
    73's de Edd likes this.
    1. Advertisements

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
  1. billcalley
    Replies:
    12
    Views:
    1,114
  2. billcalley
    Replies:
    12
    Views:
    884
  3. mm
    Replies:
    2
    Views:
    987
  4. jeepinjeff

    50 IR LEDs powered by 9v battery??

    jeepinjeff, Aug 10, 2011, in forum: Circuit Help
    Replies:
    15
    Views:
    2,381
    donkey
    Aug 15, 2011
  5. BurningFuses
    Replies:
    4
    Views:
    1,903
    George Herold
    Nov 8, 2013
  6. kamilavalamp

    Car Battery Powered House Ideas, Questions

    kamilavalamp, Aug 4, 2015, in forum: General Electronics Chat
    Replies:
    17
    Views:
    551
  7. SirLSD
    Replies:
    3
    Views:
    122
    (*steve*)
    Feb 27, 2017
Loading...