low voltage LED lighting -- OOOPS wrong place

[btcruzer]

I've found some LED light fixtures at Harbor Freight that my wife likes. They provide plenty of light where we need it and look like they belong there. They operate on 6 AA batteries but are actually 2 banks of three cells to provide 4.5 volts. I've installed 2 of these in one area and rewired them to connect to a step down adjustable power supply module that reduces the "house" 12volts to the required 4.5 volts. Problem is --- I only ordered one voltage reducer and now the wife wants more lights. On the other side of the room. I'm thinking a resistor could be used to drop the voltage. BUT what value of resistor? I'm assuming the step down adjustable power supply module that I used will keep the output voltage at the 4.5 volts even if the input varies from 12 volts to 14.2 volts. I figure that if a resistor is used, that the supply voltage should be considered as 14.2 when figuring he resistor value to obtain the desired 4.5 volts. But would that then make the lights too dim when on batteries only?

[96Bounder30E]

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[Paul1944]

camperpaul wrote:
How much current (Amps) do those light fixtures draw?

I really like the map on your signature, how can I add this to mine?

[btcruzer]

I don't know the current draw of these fixtures but it's gotta be tiny. I do have all the other lighting in the trailer using 12V LEDs. You gotta understand - these lights are THE ONE she wants. She will have them. See my post in the DYI modifications form, I think we have this thing resolved.

[Shadow_Catcher]

Resistors reduce power/voltage by turning the current to heat, not a good trade off. You would be ahead with 12v fixtures or converting the HF to 12V.
I provided all the LED fixtures that are in our trailer after having converted the fixtures in our first trailer.

[camperpaul]

How much current (Amps) do those light fixtures draw?