I wanted to put some light to my 3D printer. The power supply outputs 12V DC and I have this old car workshop LED torch that had it's batteries leaked. I disassembled it and cleaned the salt from the leak. I'd now want to remove the battery connectors and replace them with a cable that goes to a socket where I can plug in 12V DC from the power supply of the 3D printer.
The circuit board of the thing is quite simple. It's basically just the switch and a resistor between the (clean) battery connector and the red cable.
The LED strip has 10 white LEDs that I don't know the exact type, connected in parallel. I just know that they been running on 4x 1.5V AAA batteries (=6V).
Can I just run this on 12V or would I better replace the resistor so the LEDs don't heat up too much and lose life? Which size should the resistor be to run the strip from 12V DC?