12v led light recommendations?
LED lighting strips and 12v car electrical system - LED Light Bulbs - BudgetLightForum.com
led - Using 12v car battery to supply multiple "3.5v" devices - Electrical Engineering Stack Exchange
LED strip w/ USB power source able to convert to 12 volt for car?
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Anyone have recommendations for good interior led lights for a 12v system? I really like the ambiance of Coleman lanterns, but want to go with led for various reasons, however I hate the white light that many of them have. Anyone have recommendations for more yellow tinted ones?
Your reading of 430 ohms does not reflect the current limit of the supply, although I don't know exactly what it does show.
Assuming 3.2 volts per LED at 0.45 amps, if your battery really is a 12 volt battery at that current (which I doubt),
simulate this circuit – Schematic created using CircuitLab will work - maybe. The 3 LEDs are in series, so they all have the same current. Assuming 3.2 volts for the LEDs, and 12 volts for the battery, this leaves $$V_R = 12 - 9.6 = 2.4 \text{ volts}$$ Then, in order to get a current of 0.45 amps, $$R = \frac{V}{i} = \frac{2.4}{0.45} = 5.33 \text{ ohms}$$
The reason I say "maybe" is that batteries don't usually have exactly the stated voltage, and it varies with both load current and state of charge. I'd suggest starting out with a 10 ohm resistor and get a feel for the circuit.
Oh yes, and you'll need a decent power rating on the dropping resistor. The power dissipated will be the voltage times the current, and I leave that for you to calculate. But it will certainly be more than 1/4 watt.
No, your circuit definitely won't work.
What you need is a DC-DC converter (also called "switch mode power supply" or similar) with a 12 volt DC input, and ~3.5 volt DC output, good for 1.5 Amps or more. You should connect all the LED lights in parallel (with no extra resistors) to the output of the DC-DC converter.