IR led light powered by car battery.

[johnpuppa]

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!

 

[KMoffett]

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