Hello, So I have put into motion a plan to build an LED array that scrolls letters. I've got the hardware and coded the assembly to make it happen but I have not yet purchased things such as the LED's themselves or op-amps to drive them. I have calculated that the load will be around 3-4A worst case scenario (all 100 LED's lit, all IC's not idle). I plan on running this contraption off a car battery that also runs a car, and my question is is this an unreasonable load for it? Further, could such a load be supplied through the cigarette lighter?