I believe I am already doing this: 1 daisy chain with 2 LEDs for one string and 2 LEDs for the next string total of two strings. I will post this schematic again in case it got swallowed up. Both chains are parallel to each other (I believe) and I do this with Adafruit breadboards 4 x 4 for each LED. I have 4 sensors on the same plane.If you’re trying to mount several LEDs on locations that are separated by some distance (you haven’t specified where they are mounted) and would like to simplify the wiring, instead of wiring each all the way back to the batteries with individual airs of wires, consider this. On each board, have four connections. Two for power in and two for power out. Carry power in to power out and wire the LED between the power connections. This allows you to daisy-chain individual LED mountings.
I run power to ballast 1 to LED 1, then power LED 1 to power 2 and then to ground. I connect a second ballast resistor to the 2nd string: I run power from 3rd LED to power 4th LED 2 string. I daisy chain 2 strings already. Or no?
My basic question still remains - what are my options for the connections themselves? Can I solder stranded wire between the board and the LED mounting? What are some other ways. Thank you! (my crimping skills for DuPont connector is pretty good but my female terrible. I would rather solder the connection then do the DuPont.